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period
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音标：英 ['pɪərɪəd] 美 ['pɪrɪəd]
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解释：
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n. 周期，期间；时期；月经；课时；（语法学）句点，句号
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adj. 某一时代的
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中文词源：
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period 时期，阶段，句号来自希腊语periodos,圈，循环，来自peri-,在周围，hodos,上路，旅程，离开，词源同anode,method.引申词义时期，阶段，句号等。
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英文词源：
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period
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period: [14] Period means etymologically ‘going round’. It comes via Old French periode and Latin periodus from Greek períodos, a compound noun formed from the prefix perí- ‘round’ and hódos ‘way’ (source also of English episode, exodus [17], and method). The main sense of the word in modern English, ‘interval of time’ (which first emerged in post-classical Latin), comes from the notion of a ‘repeated cycle of events’ (now more obvious in the derivative periodical [17]).
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=> episode, exodus, method
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period (n.)
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early 15c., "course or extent of time," from Middle French periode (14c.) and directly from Medieval Latin periodus "recurring portion, cycle," from Latin periodus "a complete sentence," also "cycle of the Greek games," from Greek periodos "cycle, circuit, period of time," literally "a going around," from peri- "around" (see peri-) + hodos "a going, way, journey" (see cede).
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Sense of "repeated cycle of events" led to that of "interval of time." Meaning "dot marking end of a sentence" first recorded c. 1600, from similar use in Medieval Latin (in late 16c. English it meant "full pause at the end of a sentence"). Sense of "menstruation" dates from 1822. Educational sense of "portion of time set apart for a lesson" is from 1876. Sporting sense attested from 1898. As an adjective from 1905; period piece attested from 1911.
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双语例句：
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1. She spent a period of time working with people dying of cancer.
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她有一段时间曾帮助垂危的癌症患者。
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来自柯林斯例句
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2. Over a given period, the value of shares will rise and fall.
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股票的价值在某一特定的时期内会有涨跌。
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来自柯林斯例句
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3. China enters a new five-year plan period next year.
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中国明年开始进入新一个五年计划期。
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来自柯林斯例句
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4. South Africa was going through a period of irreversible change.
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南非正在经历一场不可逆转的变革。
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来自柯林斯例句
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5. The next few weeks will be a period of readjustment.
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接下来的几周将是适应阶段。
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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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a period of consultation/mourning/uncertainty
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磋商 / 哀悼 / 形势不明朗的期间【牛津词典】
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The factory will be closed down over a 2-year period/a period of two years.
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这家工厂将在两年内关闭。【牛津词典】
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This compares with a 4% increase for the same period last year.
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这个数字与去年同期的4%升幅相近。【牛津词典】
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This offer is available for a limited period only.
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这项优惠仅在限期内有效。【牛津词典】
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All these changes happened over a period of time .
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所有这些变化都是在一段时间内发生的。【牛津词典】
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The aim is to reduce traffic at peak periods .
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目的是缓解高峰期间的交通状况。【牛津词典】
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You can have it for a trial period (= in order to test it) .
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这东西你可以试用一段时间。【牛津词典】
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Which period of history would you most like to have lived in?
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你最喜欢生活在哪一个历史时期？【牛津词典】
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the post-war period
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战后时期【牛津词典】
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Like Picasso, she too had a blue period.
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和毕加索一样，她也有过一段消沉时期。【牛津词典】
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Most teenagers go through a period of rebelling.
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大多数青少年都要经历一段叛逆期。【牛津词典】
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the Jurassic period
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侏罗纪【牛津词典】
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‘What do you have next period? ’ ‘French. ’
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“你下一节是什么课？”“法语。”【牛津词典】
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a free/study period (= for private study)
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自习课【牛津词典】
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period pains
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痛经【牛津词典】
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monthly periods
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月经【牛津词典】
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When did you last have a period ?
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你上一次月经是什么时候？【牛津词典】
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The answer is no, period!
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答复是不，不再说了！【牛津词典】
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This crisis might last for a long period of time.
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这次危机可能持续很长时间。【柯林斯高阶英语词典】
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...a period of a few months.
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几个月时间【柯林斯高阶英语词典】
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...a period of economic good health and expansion...
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经济健康发展并且不断扩张的一段时期【柯林斯高阶英语词典】
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He went through a period of wanting to be accepted...
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有一段时间他很想被人接受。【柯林斯高阶英语词典】
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...the Roman period...
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罗马帝国时代【柯林斯高阶英语词典】
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No reference to their existence appears in any literature of the period.
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这一时期的文学作品中都没有提及他们的存在。【柯林斯高阶英语词典】
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...dressed in full period costume.
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穿着宽松的古装【柯林斯高阶英语词典】
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...replicas of period instruments.
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古乐器的复制品【柯林斯高阶英语词典】
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They accompanied him during his exercise periods.
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练习的时候他们陪着他。【柯林斯高阶英语词典】
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...periods of private study.
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自习课【柯林斯高阶英语词典】
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...taking his scripts to school in order to learn the lines in free periods.
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把他的剧本带到学校以便空闲的时候背台词【柯林斯高阶英语词典】
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I don't want to do it, period.
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我不想做，这事就到此为止吧。【柯林斯高阶英语词典】
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Leah easily could have fallen into a trap of feeling content; instead, her energy sparked a period of experimentation and renewal.【出自-2017年6月阅读原文】
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At some point, almost all of us will experience a period of radical professional change.【出自-2017年6月阅读原文】
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It was a wonderful period.【出自-2017年6月听力原文】
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In fact, I’d like to relive a period I’ve already lived: the 1960s—I was in my twenties, and everything was being renewed.【出自-2017年6月听力原文】
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Writers may experience periods of time in their life when they just can't produce anything.【出自-2015年12月阅读原文】
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His fall from grace in the 1980s, followed by his return to Apple in 1996 after a period in the wilderness, is an inspiration to any businessperson whose career has taken a turn for the worse.【出自-2012年12月阅读原文】
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The past 15 years or so have been a noticeable period of improvement for food in England," the English chef says, citing the trend in British cuisine for better ingredients, preparation and cooking methods, and more appealing presentation.【出自-2011年6月阅读原文】
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If you age more slowly over a longer time period, then you are in some sense younger for longer.【2019年6月四级真题（第一套）阅读 Section B】
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In fact, I'd like to relive a period I've already lived: the 1960s—I was in my twenties, and everything was being renewed.【2017年6月四级真题（第二套）听力 Section C】
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They found that, overall, 31% of marriages ended in divorce over the period studied.【2019年6月四级真题（第一套）阅读 Section C】
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Travel was arduous and costly throughout the period, possible only for a privileged class—the same that produced gentlemen scientists, authors, antique experts, and patrons of the arts.【出自-2017年6月阅读原文】
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Most Grand Tourists, however, stayed for briefer periods and set out with less scholarly intentions, accompanied by a teacher or guardian, and expected to return home with souvenirs of their travels as well as an understanding of art and architecture formed by exposure to great masterpieces.【出自-2017年6月阅读原文】
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Middle school is a crucial period when students may become keenly interested in advanced mathematics.【出自-2017年6月阅读原文】
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Why, then, has this claim become so popular?Part of the answer is that this is what always happens during periods of high unemployment—in part because experts and analysts believe that declaring the problem deeply rooted, with no easy answers, makes them sound serious.【出自-2016年6月阅读原文】
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Perhaps there is less to fight about, with the country in a period of tranquility and the dangers of drug abuse and other unwholesome behavior well known.【出自-2016年6月阅读原文】
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It was in a free fall, and it was a veryscary period, economist Martin Neil Baily said.【出自-2016年6月听力原文】
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Basically the tech industry seems to be in an awkward period now.【出自-2016年12月阅读原文】
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The third element of love in Sternberg’s theory is what he calls decision commitment, the decision that one is in a love relationship, the willingness to label it as such and the commitment to maintain that relationship at least for some period of time.【出自-2016年12月听力原文】
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They have to operate for long periods of time before the costs of development have been recovered.【出自-2015年12月阅读原文】
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This means that there could be an extra three billion mouths to feed by the end of the century, a period in which substantial changes are anticipated in the wealth, calorie intake and dietary preferences of people in developing countries across the world.【出自-2013年12月阅读原文】
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Copyright laws differ from country to country, but in general protection extends for the duration of an author's life and for a substantial period afterwards, thus allowing the author's heirs to benefit.【出自-2011年12月阅读原文】
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In Britain and America, this post-death period is 70 years【出自-2011年12月阅读原文】
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Nobody ever had a better time or did more exotic strange things than I did in an 80-year period.【出自-2013年12月听力原文】
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Ebola was so deadly and killed so quickly that within a short period of time, there was no one around to infect.【出自-2013年6月听力原文】
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million years, a period when global temperatures probably were not significantly higher than they are today.【出自-2010年12月听力原文】
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In the case of Facebook, the company says data may hang around until the URL in question is reused, which is usually "after a short period of time", though obviously that time can vary considerably【出自-2010年12月听力原文】
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For us it'll have to operate for long periods of time in very cold temperatures.【出自-2010年12月听力原文】
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And a 2015 study from the University of California, Berkeley, found that teens who go to bed late are more likely to gain weight over a five-year period.【2017年12月六级真题（第二套）听力 Section B 】
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Beyond revealing population-wide patterns, the right combination of data and analysis can also help individuals identify unique characteristics of their own behavior, including conditions that could indicate the need for some form of intervention-such as 【2018年12月六级真题（第一套）阅读 Section C】
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But by buying while young, the premiums are paid in for a longer period of time.【2017年12月六级真题（第二套）听力 Section C】
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Sadly, the data also showed face-to-face socializing and sports activity had declined over the period covered by the survey.【2019年12月六级真题（第一套）阅读 Section B】
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The study was conducted over a】
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