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原文链接 原文链接 Merriam-Webster’s Word of the Day for January 31, 2019 is: raddled • \RAD-uld\  • adjective 1 : being in a state of confusion : lacking composure 2 : broken-down , worn Examples: We were met at the door by a raddled old man who turned out to be the actor’s father, and who in his day had also been an estimable presence on the London stage. “The real skill of Swan Song is the kaleidoscopic portrait it paints of its  raddled  hero. The narrative moves through time from Capote’s tawdry childhood and friendship with Harper Lee to his withered end in Fu Manchu pyjamas.” — Alex Preston, The Observer (London), 22 July 2018 Did you know? The origin of raddled is unclear. Its participial form suggests verbal parentage, and indeed there is a verb raddle just a few decades older than raddled that seems a likely source. This raddle means “to mark or paint with raddle,” raddle here being red ocher , or sometimes other pigments, used for marking animals....

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 30, 2019 is: proliferate • \pruh-LIF-uh-rayt\  • verb 1 : to grow or cause to grow by rapid production of new parts, cells, buds, or offspring 2 : to increase or cause to increase in number as if by proliferating : multiply Examples: “ Muskies in Lake St. Clair are a world-class presence because local folks 30 years ago got smart. They agreed on a catch-and-release ethic. Catch the muskie. Put it back into the water. And watch a species  proliferate .” — Lynn Henning, The Detroit News , 26 December 2018 “The surge in the price of bitcoin , and of other cryptocurrencies , which proliferated  amid a craze for initial coin offerings, prompted a commensurate explosion in the number of stories and conversations about this new kind of money….” — Nicholas Paumgarten, The New Yorker , 22 Oct. 2018 Did you know? Proliferate is a back-formation of proliferation . That means that proliferation came first (we ...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 29, 2019 is: charisma • \kuh-RIZ-muh\  • noun 1 : a personal magic of leadership arousing special popular loyalty or enthusiasm for a public figure (such as a political leader) 2 : a special magnetic charm or appeal Examples: The young singer had the kind of charisma that turns a performer into a star. “Winner of seven Tony Awards including Best Musical, ‘Evita’ is the story of Eva Peron who used her charisma and charms to rise from her penniless origins to political power as the first lady of Argentina at the age of 27.” — Oscar Sales, The Press Journal (Vero Beach, Florida), 19 Dec. 2018 Did you know? The Greek word charisma means “favor” or “gift.” It is derived from the verb charizesthai (“to favor”), which in turn comes from the noun charis , meaning “grace.” In English, charisma has been used in Christian contexts since the mid-1500s to refer to a gift or power bestowed upon an individual by the Holy ...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 28, 2019 is: sleuth • \SLOOTH\  • verb 1 : to act as a detective : search for information 2 : to search for and discover Examples: “Farmer would go sleuthing in the archives of Arizona State University’s Center for Meteorite Studies to find evidence of an undiscovered landfall in Canada, and Ward could build a rig that trailed an 11-foot metal detector behind a combine, which is how they unearthed $1 million in pallasite fragments from several square miles of Alberta farmland.” — Joshuah Bearman and Allison Keeley, Wired , January 2019 “For more than five decades, Morse has sleuthed out long-lost family trees for a living. From his home base here in Haywood, Morse travels the world tracking down missing heirs.” — Becky Johnson, The Mountaineer (Haywood County, North Carolina), 20 Nov. 2018 Did you know? “They were the footprints of a gigantic hound!” Those canine tracks in Arthur Conan Doyle’s The Hound of ...

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原文链接 原文链接 Merriam-Webster’s Word of the Day for January 27, 2019 is: foray • \FOR-ay\  • noun 1 : a sudden or irregular invasion or attack for war or spoils : raid 2 : an initial and often tentative attempt to do something in a new or different field or area of activity Examples: “Although she debuted a line of jewelry last year, this is her first foray into creating her own makeup line.” — Hayley Schueneman, The New York Magazine , 28 Nov. 2018 “Edgardo Defortuna has been flying high for years, … erecting a string of ultra-luxury condo and hotel towers on his way to becoming one of Miami’s most prominent developers. He recently announced his first foray outside South Florida, unveiling a design for a trio of luxury towers in Paraguay.” — Andres Viglucci and Rene Rodriguez, The Miami Herald , 16 Dec. 2018 Did you know? Foray comes from Middle English forrayen and probably traces back to an Anglo-French word that meant “raider” or “forager.” It’s related to the wo...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 26, 2019 is: doldrums • \DOHL-drumz\  • plural noun 1 : a spell of listlessness or despondency 2 often capitalized Doldrums : a part of the ocean near the equator abounding in calms , squalls , and light shifting winds 3 : a state or period of inactivity, stagnation, or slump Examples: “A vacation on a tropical island could be just the thing you need to fight against the winter doldrums ,” said Christine as she handed me the resort’s brochure. “At the time, the bourbon industry was in the process of emerging from a lengthy period of doldrums and rebranding itself as not just something old men drank.” — The Kentucky Standard , 21 Nov. 2018 Did you know? Almost everyone gets the doldrums—a feeling of low spirits and lack of energy—every once in a while. The doldrums experienced by sailors, however, are usually of a different variety. In the early-19th century, the word once reserved for a feeling of desponde...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 25, 2019 is: myopic • \mye-OH-pik\  • adjective 1 : affected by myopia : of, relating to, or exhibiting myopia : nearsighted 2 : lacking in foresight or discernment : narrow in perspective and without concern for broader implications Examples: “This is, on the whole, an encouraging finding. If children became myopic due to looking at objects too closely, then we’d be stuck with an unsolvable dilemma: choosing between teaching children to read and protecting their eyesight.” — Brian Palmer, Slate , 16 Oct. 2013 “But even the most myopic seer can foretell with near certainty that our traditional use of privately owned vehicles running on fossil fuels is going to be giving way to new mobility options, and soon.” — John Gallagher, The Detroit Free Press , 9 Dec. 2018 Did you know? Myopia is a condition in which visual images come to a focus in front of the retina of the eye, resulting in defective vision of di...

原文链接 周五中午啦～ 吃完午饭，下午继续工作！ （由 IFTTT 发送） Lake桑 January 25, 2019 at 12:00PM

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 24, 2019 is: adjudicate • \uh-JOO-dih-kayt\  • verb 1 : to make an official decision about who is right in (a dispute) : to settle judicially 2 : to act as judge Examples: “… Nichols said in addition to the nine dogs brought to the shelter, it is housing 31 dogs that were confiscated in animal cruelty or neglect cases. She said the shelter has to board the dogs, feed them and care for them until the cases are adjudicated .” — Russ Coreyemp, The Times Daily (Florence, Alabama), 16 Dec. 2018 “To qualify as a couture house, which is an official designation like champagne, a brand must maintain an atelier of a certain number of artisans full time and produce a specific number of garments twice a year for a show. There are only a very few that can fulfill the requirements…. A lot have dropped out over the years …, and the governing organization that adjudicates  this has relaxed some of its rules to admit young...

原文链接 我们终于开了论坛。 准确的来说就我一个人。 链接： https://lakejason0.wixsite.com/forum Lake桑 2019.1.23 Advertisements

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 23, 2019 is: imbroglio • \im-BROHL-yoh\  • noun 1 a : an acutely painful or embarrassing misunderstanding b : a circumstance or action that offends propriety or established moral conceptions or disgraces those associated with it : scandal c : a violently confused or bitterly complicated altercation : embroilment d : an intricate or complicated situation (as in a drama or novel) 2 : a confused mass Examples: “He was close to scandal—GOP chairman during the Watergate years, vice president during the Iran-Contra imbroglio —yet was not tainted by it.” — David M. Shribman, The Boston Globe , 1 Dec. 2018 “The present imbroglio follows protracted struggles over the budget of the sheriff’s office, the fate of the 911 system, the county role in reducing blight and who should pay what for animal control.” — Rockford (Illinois) Register Star , 13 Dec. 2018 Did you know? Imbroglio and embroilment are more than ju...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 22, 2019 is: cumulate • \KYOO-myuh-layt\  • verb 1 : to gather or pile in a heap 2 : to combine into one 3 : to build up by addition of new material Examples: “In the alternative, the company may provide greater input to minority shareholders by allowing shareholders to cumulate their votes and cast them all for one director.” — Gregory Monday, The Milwaukee Business Journal , 5 Mar. 2018 “The report … compares various income estimates and reaches a similar conclusion: Most Americans have realized small annual increases that ultimately cumulated into meaningful gains.” — Robert Samuelson, The Sun Journal (Lewiston, Maine), 12 Dec. 2018 Did you know? Cumulate and its far more common relative accumulate both come from the Latin word cumulare, meaning “to heap up.” Cumulare , in turn, comes from cumulus, meaning “mass.” ( Cumulus functions as an English word in its own right as well. It can mean “heap” or ...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 21, 2019 is: substantive • \SUB-stun-tiv\  • adjective 1 : having substance : involving matters of major or practical importance to all concerned 2 : considerable in amount or numbers : substantial 3 a : real rather than apparent : firm ; also : permanent , enduring b : belonging to the substance of a thing : essential c : expressing existence 4 a : having the nature or function of a noun b : relating to or having the character of a noun or pronominal term in logic 5 : creating and defining rights and duties Examples: “How many more carefully researched reports will need to be released before we finally act in a substantive way to protect our only home, planet Earth?” — Edwin Andrews, The New York Times , 14 Dec. 2018 “These are the moments—funny, yet  substantive  and cuttingly insightful—that will remain in the collective memory long after Ralph Breaks the Internet leaves cinemas an...

原文链接 一周又开始了。加油工作！（由 IFTTT 发送） Lake桑 January 21, 2019 at 07:00AM

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 20, 2019 is: wherewithal • \WAIR-wih-thawl\  • noun : means or resources for purchasing or doing something; specifically : financial resources : money Examples: If I had the wherewithal , I’d buy that empty lot next door and put in a garden. “Typically, when a person makes more money and has more savings, they add credit such as signing up for a new card or taking on a car loan. That’s because they’re confident they have the financial wherewithal to pay back the debt.” — Janna Herron, USA Today , 5 Dec. 2018 Did you know? Wherewithal has been with us in one form or another since the 16th century. It comes from our still-familiar word where , and withal , a Middle English combination of with and all , meaning “with.” Wherewithal has been used as a conjunction meaning “with or by means of which” and as a pronoun meaning “that with or by which.” These days, however, it is almost always used as a noun referring ...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 19, 2019 is: gargantuan • \gahr-GAN-chuh-wuhn\  • adjective : tremendous in size, volume, or degree : gigantic , colossal Examples: “In 1920, the town council of Chamonix … decided to change the municipality’s name to Chamonix-Mont-Blanc, thus forging an official link to the mountain … with a summit that soars 12,000 feet above the town center. The council’s goal was to prevent their Swiss neighbors from claiming the mountain’s glory, but there was really no need: It’s impossible when you’re in Chamonix to ignore the gargantuan , icy beauty that looms overhead.” — Paige McClanahan, The New York Times , 13 Dec. 2018 “Due to our gargantuan scope, Houston is a haven for live music. As the nation’s fourth largest city, we have become a destination for touring acts by default—it certainly isn’t because of our collective reputation as an audience….” — Matthew Keever, The Houston Press , 17 Dec. 2018 Did you know? ...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 18, 2019 is: teetotaler • \TEE-TOH-tuh-ler\  • noun : one who practices or advocates teetotalism : one who abstains completely from alcoholic drinks Examples: “… he is one of those fit older people who have redefined what 74 can look like. It probably helps that he is a teetotaler , a choice he made as a young man, having been disturbed by the effect that alcohol had on members of his family.” — David Kamp, Vanity Fair , December 2017 “The names Rockefeller and Diego Rivera are forever intertwined thanks to the Mexican artist’s infamous mural at Rockefeller Center, which the family commissioned in 1932 and had demolished two years later—due in part to its depiction of the teetotaler  John D. Rockefeller Jr. sipping a martini.” — Adam Rathe, Town & Country , May 2018 Did you know? A person who abstains from alcohol might choose tea as his or her alternative beverage, but the word teetotaler has...

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原文链接 原文链接 Merriam-Webster’s Word of the Day for January 17, 2019 is: farouche • \fuh-ROOSH\  • adjective 1 : unruly or disorderly : wild 2 : marked by shyness and lack of social graces Examples: “Though she wrote three ‘novels’ (more extended free associations than novels as we know them), she is best thought of as a poet of small, farouche poems illustrated with doodles….” — Rosemary Dinnage, The New York Review of Books , 25 June 1987 “Jeremy Irons’s natural mode as an actor is fastidious rather than farouche , but he perfectly captures James Tyrone’s professional extravagance and personal meanness.” — Michael Arditti, The Sunday Express , 11 Feb. 2018 Did you know? In French, farouche can mean “wild” or “shy,” just as it does in English. It is an alteration of the Old French word forasche , which derives via Late Latin forasticus (“living outside”) from Latin foras , meaning “outdoors.” In its earliest English uses, in the middle of the 18th century, farouche ...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 16, 2019 is: nomothetic • \nah-muh-THET-ik\  • adjective : relating to, involving, or dealing with abstract, general, or universal statements or laws Examples: “Moreover, there is the often-incorrect assumption that crimes and offenders are sufficiently similar to be lumped together for aggregate study. In such cases the resulting nomothetic knowledge is not just diluted, it is inaccurate and ultimately misleading.” — Brent E. Turvey, Criminal Profiling , 2011 “First, they can expect to find an investigation of the ways in which males and females differ universally: that is, of the nomothetic principles grounded in biology and evolutionary psychology that govern sex-differentiated human development.” — Frank Dumont, A History of Personality Psychology , 2010 Did you know? Nomothetic is often contrasted with idiographic , a word meaning “relating to or dealing with something concrete, individual, or unique.” Wher...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 15, 2019 is: liaison • \LEE-uh-zahn\  • noun 1 : a binding or thickening agent used in cooking 2 a : a close bond or connection : interrelationship b : an illicit sexual relationship : affair 3 a : communication for establishing and maintaining mutual understanding and cooperation (as between parts of an armed force) b : a person who establishes and maintains communication for mutual understanding and cooperation 4 : the pronunciation of an otherwise absent consonant sound at the end of the first of two consecutive words the second of which begins with a vowel sound and follows without pause Examples: “Brennan and Alejandro Castro agreed on a series of steps to build confidence. One called for the Cubans to post an officer in Washington to act as a formal liaison between the two countries’ intelligence agencies.” — Adam Entous, The New Yorker , 19 Nov. 2018 “… the book offers vignettes that describe Smit...

原文链接 觊 jì 觎 yú 解释： （动）企图获取（非分的东西） （名）非分的愿望或企图 例句： 祖国的领土，岂容列强觊觎！ 觊觎大位 | 心怀觊觎 相关文献： 《 左传 · 桓公二年》： “ 庶人 、工、商，各有分亲，皆有等衰。是以民服事其上，而下无觊觎。 ” 杜预 注： “ 下不冀望上位。 ” Lake桑 2019.1.14

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 14, 2019 is: mea culpa • \may-uh-KOOL-puh\  • noun : a formal acknowledgment of personal fault or error Examples: The mayor’s public mea culpa for his involvement in the scandal didn’t satisfy his critics. “The internal investigation ended with a mea culpa from the sheriff’s department and a reprimand and reassignment for a deputy overseeing the property room.” — Allie Morris, The Houston Chronicle , 15 Nov. 2018 Did you know? Mea culpa , which means “through my fault” in Latin, comes from a prayer of confession in the Catholic Church. Said by itself, it’s an exclamation of apology or remorse that is used to mean “It was my fault” or “I apologize.” Mea culpa is also a noun, however. A newspaper might issue a mea culpa for printing inaccurate information, or a politician might give a speech making mea culpas for past wrongdoings. Mea culpa is one of many English terms that derive from the Latin culpa , meaning “...

原文链接 一周又开始了。加油工作！（由 IFTTT 发送） Lake桑 January 14, 2019 at 07:00AM

原文链接 冒险者日记 —-LakeJason

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 13, 2019 is: clement • \KLEM-unt\  • adjective 1 : inclined to be merciful : lenient   2 : not severe : mild Examples: The judge decided to be clement and said she would forgive the young defendants so long as they paid back the money they stole from the fundraiser. “Eagle Scout Michael Eliason completed his project by literally blazing a trail: he created a half-mile-long trail along a Heights park still being developed along the Yellowstone River, Dover Park. ‘We rototilled and used pickaxes on it, and we had to wait until the weather was clement ,’ he said.” — Mike Ferguson, The Billings Gazette , 24 Nov. 2014 Did you know? Defendants in court cases probably don’t spend much time worrying about inclement weather. They’re too busy hoping to meet a clement judge so they will be granted clemency. They should hope they don’t meet an inclement judge! Clement , inclement , and clemency all derive from the L...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 12, 2019 is: boycott • \BOY-kaht\  • verb : to engage in a concerted refusal to have dealings with (a person, a store, an organization, etc.) usually to express disapproval or to force acceptance of certain conditions Examples: “Chinese boycotted  Norwegian salmon over the awarding of the Nobel Peace Prize to the late dissident writer Liu Xiaobo. They stopped buying fruit from the Philippines amid a dispute over territory in the South China Sea.” — Associated Press , 13 Dec. 2018 “[Saul] Bellow … showed up at President Johnson’s White House Festival of the Arts in the summer of 1965, which other writers, such as Philip Roth (a friend and follower) and Robert Lowell, boycotted to protest against the war in Vietnam.” — Benjamin Markovits, The Spectator , 17 Nov. 2018 Did you know? In the 1870s, Irish farmers faced an agricultural crisis that threatened to result in a repeat of the terrible famine and mass evict...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 11, 2019 is: syllogism • \SIL-uh-jiz-um\  • noun 1 : a deductive scheme of a formal argument consisting of a major and a minor premise and a conclusion 2 : a subtle, specious , or crafty argument 3 : deductive reasoning Examples: “Plato’s pupil Aristotle developed the techniques of logical analysis that still enable us to get at the knowledge hidden within us. He examined propositions by stating possible contradictions and developed the syllogism , a method of proof based on stated premises.” — Mary Lefkowitz, The New York Times Book Review , 23 Jan. 2000 “In some states … there are calls to eliminate courses in literature, philosophy, history and other fields of the humanities. Students want and need technical, employable skills, not sonnets or syllogisms , it is said.” — Scott D. Miller, The Virginian-Pilot (Norfolk, Virginia), 3 June 2018 Did you know? For those trained in formal argument, the syllogism i...

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原文链接 原文链接 Merriam-Webster’s Word of the Day for January 10, 2019 is: venal • \VEE-nul\  • adjective 1 : capable of being bought or obtained for money or other valuable consideration : purchasable ; especially : open to corrupt influence and especially bribery : mercenary 2 : originating in, characterized by, or associated with corrupt bribery Examples: “We have to prove that our institutions are more important than our ideologies, that the dream, the whisper, the precious possibility of America cannot be trampled by the corrupt and the fraudulent, the venal and the lecherous.” — Charles M. Blow, The New York Times , 9 Dec. 2018 “He held combative press conferences outlining … corporate malpractice and passed along to journalists dossiers that described the way venal oligarchs engaged in asset stripping, wasteful spending, and share dilutions.” — Joshua Yaffa, The New Yorker , 20 Aug. 2018 Did you know? If you are given the choice between acts that are venal and...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 9, 2019 is: behest • \bih-HEST\  • noun 1 : an authoritative order : command 2 : an urgent prompting Examples: “Let’s be clear on this, in the case of a foreclosure sale, while you might not think of it as a ‘sale’ because it is not a voluntary action taken by the homeowner, but rather a forced action at the behest of the lender, for tax purposes a foreclosure is treated exactly the same as a voluntary sale by the buyer.” — Tony Nitti, Forbes , 19 Nov. 2018 “He is being detained at the behest of Japanese prosecutors after Nissan alleged that he had understated his earnings and misused company assets.” — The Economist , 24 Nov. 2018 Did you know? Today’s word first appeared in Old English and was formed from the prefix be- and the verb hātan (“to command” or “to promise”). While behest was originally used only in the sense of “promise,” it acquired the additional sense of “command” among speakers of Middle E...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 8, 2019 is: malinger • \muh-LING-gur\  • verb : to pretend or exaggerate incapacity or illness (as to avoid duty or work) Examples: Sarah’s prospects for promotion aren’t helped by her well-known tendency to malinger . “[Writer Jaroslav] Hašek’s meandering, unfinished comedy tells the story of a dog thief turned soldier, who blusters, pranks and malingers his way through the early days of the war.” — Daniel Mason, The Guardian (London), 14 Nov. 2018 Did you know? Do you know someone who always seems to develop an ailment when there’s work to be done? Someone who merits an Academy Award for his or her superb simulation of symptoms? Then you know a malingerer. The verb malinger comes from the French word malingre , meaning “sickly,” and one who malingers feigns illness. In its earliest uses in the early 19th century, malinger usually referred to a soldier or sailor pretending to be sick or insane to shirk duty. ...

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 7, 2019 is: demotic • \dih-MAH-tik\  • adjective 1 : of, relating to, or written in a simplified form of the ancient Egyptian hieratic writing 2 : of or relating to people and especially their speech : popular , common 3 : of or relating to the form of Modern Greek that is based on everyday speech Examples: “[The Rosetta Stone] features three columns of the same inscription in three languages: Greek, hieroglyphs and demotic Egyptian—and is the text of a decree written by priests in 196 BC, during the reign of pharaoh Ptolemy V.” — Ashley Lime, BBC.com , 23 Nov. 2018 “When it came time to make her own wine …, she continued taking the natural path, bent earnestly to the task of revitalizing California winemaking with a demotic , punk-rock spirit.” — Jeff Gordinier et al., Esquire , 25 Apr. 2017 Did you know? You may recognize the root of demotic from words like democracy and demography . The source of these ...

原文链接 一周又开始了。加油工作！（由 IFTTT 发送） Lake桑 January 07, 2019 at 07:00AM

原文链接 汉字（你现在看到的语言的书写体系），是从甲骨文甚至之前的文字演变而来的。严格意义上来说，现在的汉字不算是象形文字，算是语素文字，就是表意文字。 现代英语的字母是由腓尼基字母演变而来的罗马字母表的字母再演变而来的。其他字母文字大体上也是腓尼基字母的变体。 请不要问我阿拉伯字母为什么会扭成那种样子。 然后，日语的假名是汉字演变过来的字母文字，韩语/朝鲜语的谚文也参考了汉字，越南语的喃字就以下省略了。 化学就更尴尬了。古代中国还没有化学这个概念，你让字母文字写一长串？举个例子。 磷 Phosphorus 你还敢说复杂的分子？ 酚酞 Phenolphthalein 然后呢？ 然后就是化学家跳不出象形文字的框框了。直到贝采里乌斯才有了现代的符号雏形。 物理基于数学，数学呢？ 先从加号开始。 “et”，拉丁文的“和”，现在已简作“&”。这个“et”还演变成了加号，与塔塔里亚使用意大利语的“plu”的“μ”一样，都是草写成了加号，也就是“+”。 “-”号也一样，拉丁语的“minus”的m写草了写成了横杠， 与我不谋而合。 简直了。 直到魏德美，德国数学家，正式于十五世纪确认了这两个符号。 乘号有不下十几种，现在只剩下了“×”与“·”两种。两个都有缺点。叉乘太像 ，也就是一个未知数，点乘又容易看成一个小数点。 总之是会看成 的。 后来还有人说要用“ ”表示相乘。这个符号现在用于集合论。 叉乘可由加号旋转得来，所以也被视为增加的符号，就保留了。点乘现在用于线段（也就是字母之间）的乘积，而叉乘与点乘在向量里面也有不同的意思。 “÷”一开始也是减号，直到有人用“:”表示比、除，用“—”（除线）表示除，才有了拉哈正式规定。 平方根曾用拉丁文“Radix”的首尾两个字母放一起表示。笛卡尔第一次用了“√”表示平方根，是字母“r”的变形，上方再加括线。 等于号“=”一开始表示两个量之间的差别，但是这么个平行又相等的线段，为什么不是等于呢？于是就变成等于号了。 “～”，莱布尼兹用它表示相似，下面加等号表示全等。 大于号小于号以及一堆括号就以下省略了。 任意/任取（全称量词）“∀”就是“Arbitrary”的“A”倒过来，同理，存在（存在量词）“∃”就是“Exist”的“E”翻过来写。 可见，这些符号的出现就是因为一个原因：...

原文链接 点击下载 点击下载使用 XMind 制作的博客总结的思维导图。 Lake桑 2019.1.6

原文链接 原文链接 Merriam-Webster’s Word of the Day for January 6, 2019 is: paradigm • \PAIR-uh-dyme\  • noun 1 : example , pattern ; especially : an outstandingly clear or typical example or archetype 2 :  an example of a  conjugation  or  declension  showing a word in all its inflectional forms 3 : a philosophical and theoretical framework of a scientific school or discipline within which theories, laws, and generalizations and the experiments performed in support of them are formulated; broadly : a philosophical or theoretical framework of any kind Examples: “I was just obsessed as a kid with David and Goliath. It’s probably the ultimate conflict paradigm in literature. But I was always on the side of Goliath. I loved Goliath. I didn’t like David at all and I wished Goliath could win.” — Lee Child, quoted in The Spectator , 1 Dec. 2018 “Phoebe has a talent for taking a musical or poetic paradigm and tilting it, inverting the norm in a way that...

原文链接 如图， 是 的直径，点C、D在 上， ， ，垂足分别为E、F，且 ，求证： 证明： 连接 由题知， 又 在 与 中 Lake桑 2019.1.5