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flag
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音标：英 [flæg] 美 [flæg]
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解释：
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vi. 标记；衰退；枯萎
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vt. 标记；插旗
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n. 标志；旗子
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中文词源：
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flag 旗帜，菖蒲，热情衰减来自辅音丛fl, 扑腾，拍打，拟声词。即模仿旗帜或菖蒲在风中晃动的声音。引申义热情衰减，主要用于形容词unflagging, 不懈的。
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英文词源：
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flag
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flag: English has at least three separate words flag, none of whose origins are known for certain. Both the noun ‘cloth used as an emblem’ [16] and the verb ‘droop, decline’ [16] may have developed from an obsolete 16th-century adjective flag ‘drooping, hanging down’, but no one knows where that came from. Flag the plant [14] is probably related to Danish flæg ‘yellow iris’, but beyond that the trail goes cold. Flag as in flag-stone [15] originally meant ‘piece of turf’.
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It probably came from Old Norse flaga ‘stone slab’. This also gave English flaw (which originally meant ‘flake’), which is related to English floe, and goes back to a Germanic base, a variant of which produced English flake.
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=> flake, flaw, floe
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flag (n.1)
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"cloth ensign," late 15c., now in all modern Germanic languages (German Flagge, Dutch vlag, Danish flag, Swedish flagg, etc.) but apparently first recorded in English, of unknown origin, but likely connected to flag (v.1) or else an independent imitative formation "expressing the notion of something flapping in the wind" [OED]. A guess considered less likely is that it is from flag (n.2) on the notion of being square and flat.
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Meaning "name and editorial information on a newspaper" is by 1956. U.S. Flag Day (1894) is in reference to the adopting of the Stars and Stripes by the Continental Congress on June 14, 1777.
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flag (v.1)
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1540s, "flap about loosely," probably a later variant of Middle English flakken, flacken "to flap, flutter" (late 14c.), which probably is from Old Norse flaka "to flicker, flutter, hang losse," perhaps imitative of something flapping lazily in the wind. Sense of "go limp, droop, become languid" is first recorded 1610s. Related: Flagged; flagging.
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flag (n.2)
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"flat stone for paving," c. 1600, ultimately from Old Norse flaga "stone slab," from Proto-Germanic *flago- (see flake (n.)). Earlier in English as "piece cut from turf or sod" (mid-15c.), from Old Norse flag "spot where a piece of turf has been cut out," from flaga.
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flag (n.3)
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plant growing in moist places, late 14c., "reed, rush," perhaps from Scandinavian (compare Danish flæg "yellow iris") or from Dutch flag; perhaps ultimately connected to flag (v.1) on notion of "fluttering in the breeze."
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flag (v.2)
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1875, "place a flag on or over," from flag (n.1). Meaning "designate as someone who will not be served more liquor," by 1980s, probably from use of flags to signal trains, etc., to halt, which led to a verb meaning "inform by means of signal flags" (1856, American English). Meaning "to mark so as to be easily found" is from 1934 (originally by means of paper tabs on files). Related: Flagged; flagging.
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双语例句：
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1. On top of the gantry the American flag flew.
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台架顶上飞舞着美国国旗。
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来自柯林斯例句
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2. They flew the flag of the African National Congress.
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他们升起非洲人国民大会的旗帜。
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来自柯林斯例句
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3. He had unmistakably been waving his flag to attract the referee's attention.
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他显然一直在挥舞旗子吸引主裁判的注意。
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来自柯林斯例句
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4. Steve Crabb can fly the flag with distinction for Britain in Barcelona.
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史蒂夫·克拉布在巴塞罗那可以旗帜鲜明地支持英国。
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来自柯林斯例句
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5. Staff can use the noticeboard to flag up any concerns.
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员工可以用布告栏表达任何关注。
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来自柯林斯例句
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更多相关例句：
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The report flagged up the dangers of under-age drinking.
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这篇报道引起大众对未成年人饮酒危害的关注。【牛津词典】
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flagging support/enthusiasm
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日益减少的支持；渐渐低落的热情【牛津词典】
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Her confidence had never flagged.
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她的信心从未减弱。【牛津词典】
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It had been a long day and the children were beginning to flag.
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这一天真漫长，孩子们都累得打起蔫来。【牛津词典】
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Our exporters keep the flag flying at international trade exhibitions.
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我们的出口商在国际贸易展览会上代表我们的国家参展。【牛津词典】
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I've flagged the paragraphs that we need to look at in more detail.
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我已用特殊记号标出我们需要更详细考虑的段落。【牛津词典】
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The American flag was flying .
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美国国旗飘扬。【牛津词典】
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All the flags were at half mast (= in honour of a famous person who has died) .
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到处都下半旗致哀。【牛津词典】
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The black and white flag went down, and the race began.
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黑白旗落下，赛跑开始了。【牛津词典】
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to swear allegiance to the flag
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面对旗帜作效忠宣誓【牛津词典】
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He was working under the flag of the United Nations.
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他在联合国工作。【牛津词典】
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yellow flags
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黄菖蒲【牛津词典】
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the flag of Italy
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意大利国旗【牛津词典】
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The hotel flies the European Union flag .
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这家饭店悬挂着欧盟的旗帜。【牛津词典】
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the Italian flag
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意大利国旗【牛津词典】
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His enthusiasm was in no way flagging...
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他的热情丝毫未减。【柯林斯高阶英语词典】
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By 4,000m he was beginning to flag.
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跑到4,000米时，他开始体力不支。【柯林斯高阶英语词典】
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Steve Crabb can fly the flag with distinction for Britain in Barcelona.
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史蒂夫·克拉布在巴塞罗那可以旗帜鲜明地支持英国。【柯林斯高阶英语词典】
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Marlette was already out of the door, flagging down a taxi.
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马利特已经出门了，正挥手招呼一辆出租车。【柯林斯高阶英语词典】
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The Marines climbed to the roof of the embassy building to raise the American flag...
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海军陆战队队员爬到使馆大楼顶上，升起了美国国旗。【柯林斯高阶英语词典】
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They had raised the white flag in surrender.
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他们已经举起白旗投降。【柯林斯高阶英语词典】
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Joining John Whitaker will be his brother Michael also riding under the British flag...
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约翰·惠特克将与他的兄弟迈克尔一起代表英国参加这场自行车赛。【柯林斯高阶英语词典】
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The airport was opened by Canadian troops operating under the flag of the United Nations.
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机场由加拿大军队以联合国的名义开放。【柯林斯高阶英语词典】
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When you forget entire experiences, he says, that's "a red flag that something more serious may be involved."【2018年6月四级真题（第二套）阅读 Section C】
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More than a century has passed since explorers raced to plant their flags at the bottom of the world, and for decades to come this continent is supposed to be protected as a scientific preserve, shielded from intrusions like military activities and mining.【出自-2016年12月阅读原文】
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Because their behaviors are not usually seen as a red flag, these young people have been dubbed the invisible risk group by the study's authors.【出自-2016年12月阅读原文】
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