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since
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音标：英 [sɪns] 美 [sɪns]
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解释：
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conj. 因为；由于；既然；自…以来；自…以后
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prep. 自…以来；自…以后
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adv. 后来
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中文词源：
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since 自从，后来，因为来自中古英语 sinnes,缩写自 sithence,来自 sithen,在此以后，-es,-ce,副词后缀，来自古英语 siththan,合成自短语 sith thaem,在此以后，来自 sith,自从，之后，thaem,那，与格形式于 that. 参照 sith,自从，之后。
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英文词源：
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since
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since: [15] Since is a contracted form of Middle English sithenes ‘since’. This in turn went back (with the addition of a final -s) to Old English siththan, a compound adverb and conjunction formed from sīth ‘after’ (a relative of German seit ‘since’) and thām ‘that’.
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since (adv.)
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early 15c., synnes, from sithenes "since," from sithen (plus adverbial genitive -es), from Old English siððan "afterward, from now on, hereafter, further, later, as soon as, after that," originally sið ðan "after that," from sið "after" (see sith) + ðan, weakened form of ðam, dative of ðæt (see that).
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As a conjunction from late 14c.; as a preposition from 1510s; "from the time when," hence "as a consequence of the fact that." Modern spelling replaced syns, synnes 16c. to indicate voiceless final -s- sound. Since when? often expressing incredulity, is from 1907.
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双语例句：
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1. Since the birds interbreed they cannot be classed as different species.
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由于这些鸟进行杂交繁殖，不能把它们归为不同的物种。
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来自柯林斯例句
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2. I've had the hots for him ever since he came to college.
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自从他来上大学后，我就对他春心萌动。
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来自柯林斯例句
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3. "Prices are down 40 per cent since Christmas," he lamented.
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“圣诞节以来物价降了4成，”他悲叹道。
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来自柯林斯例句
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4. The mechanics of the job, however, have changed little since then.
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不过，工作流程从那以后就几乎没有任何变化。
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来自柯林斯例句
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5. Rock'n'roll has become so commercialised and safe since punk.
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摇滚乐自从朋克乐以后就已经过于商业化而缺乏新意了。
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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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She's been off work since Tuesday.
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星期二以来她一直没上班。【牛津词典】
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We've lived here since 1994.
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自1994年以来我们一直住在这里。【牛津词典】
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I haven't eaten since breakfast.
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早饭以后我还没吃过东西呢。【牛津词典】
38、
He's been working in a bank since leaving school.
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他中学毕业以后一直在一家银行工作。【牛津词典】
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Since the party she had only spoken to him once.
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那次聚会以后，她只和他说过一次话。【牛津词典】
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‘They've split up. ’ ‘ Since when? ’
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“他们分手了。”“什么时候的事儿？”【牛津词典】
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That was years ago. I've changed jobs since then .
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那是多年以前的事了。自那以来我已经换过几个工作了。【牛津词典】
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Since when did he ever listen to me?
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他什么时候听过我的话？【牛津词典】
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Cath hasn't phoned since she went to Berlin.
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卡思自从去了柏林还没有打来过电话。【牛津词典】
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It was the first time I'd had visitors since I'd moved to London.
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那是我搬到伦敦以后第一次有人来看我。【牛津词典】
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It's twenty years since I've seen her.
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我已经二十年没见她了。【牛津词典】
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How long is it since we last went to the theatre?
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我们多久没去看戏了？【牛津词典】
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She had been worrying ever since the letter arrived.
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自从接到那封信后她就一直焦虑不安。【牛津词典】
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We thought that, since we were in the area, we'd stop by and see them.
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我们想，既然到了这个地方，就该顺便去看看他们。【牛津词典】
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He left home two weeks ago and we haven't heard from him since.
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他两周前离家外出，我们至今还没有他的音信。【牛津词典】
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The original building has long since (= long before now) been demolished.
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原来的建筑老早就拆了。【牛津词典】
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We were divorced two years ago and she has since remarried.
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我们两年前离了婚，之后她又再婚了。【牛津词典】
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Jacques Arnold has been a member of parliament since 1987...
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雅克·阿诺德自 1987 年以来一直是议会议员。【柯林斯高阶英语词典】
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She had a sort of breakdown some years ago, and since then she has been very shy...
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几年前她得了神经衰弱，自那以后就变得十分腼腆。【柯林斯高阶英语词典】
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The percentage increase in reported crime in England and Wales this year is the highest since the war...
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今年英格兰和威尔士报道的犯罪增长率是战后以来最高的。【柯林斯高阶英语词典】
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He turned out to have more battles with the Congress than any president since Andrew Johnson.
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结果他是自安德鲁·约翰逊以来和国会斗争最多的一任总统。【柯林斯高阶英语词典】
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About six thousand people were arrested, several hundred of whom have since been released...
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约 6,000 人被捕，后来其中的几百人又被释放了。【柯林斯高阶英语词典】
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His style of leadership has attracted increasing criticism among his supporters, many of whom have since left Central Office.
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他的领导风格已经在他的拥趸中引起了越来越多的批评，很多人后来离开了总局。【柯林斯高阶英语词典】
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Even though her parents have long since died, she still talks about them in the present tense.
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尽管双亲早已离世，她谈论起他们时好像他们至今健在。【柯林斯高阶英语词典】
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I'm forever on a diet, since I put on weight easily...
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我永远都在减肥，因为我很容易长胖。【柯林斯高阶英语词典】
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Since she did not make enough money to live in her own house, she went back to live with her mother.
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她挣的钱不够自己一个人住，于是搬回去和她妈妈一起住了。【柯林斯高阶英语词典】
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Since then, she has founded two yoga studios, met a new life partner, and formed a new community of people.【出自-2017年6月阅读原文】
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It didn't take long for magazines and documentary film-makers to come to understand her total recall, and thanks to the subsequent media interest, a few dozen other subjects ( ' , including Veiseh) have since come forward and contacted the team at the University of California, Irvine.【出自-2017年6月阅读原文】
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Emailing the neuroscientist and memory researcher Jim McGaugh one day, she claimed that she could recall every day of her life since the age of 12.【出自-2017年6月阅读原文】
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With this comprehensive knowledge of the history of art, he has since become a professional painter.【出自-2017年6月阅读原文】
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Since the current world food shortage is trend-driven, the environmental trends that cause it must be reversed.【出自-2016年6月阅读原文】
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Since industrialization, maintaining such a slow cultural metabolism has been much harder, with the long midday meal shrinking to whatever could be stuffed into a lunch bucket or bought at a food stand.【出自-2016年6月阅读原文】
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As water tables have fallen and irrigation wells have gone dry, China's wheat crop, the world's largest, has declined by 8% since it peaked at 123 million tons in 1997.【出自-2016年6月阅读原文】
91、
The team at Frontpoint addresses the issue in a blog on its site, citing their own jam protection software and claiming that there aren't any documented cases of successful jam attack since the company began offering wireless security sensors in the 1980s.【出自-2016年12月阅读原文】
92、
Maria McCartney has been in the mobile ice-cream business since 2005.【出自-2016年12月听力原文】
93、
The common prescription is to primarily shop the grocery store, since that's where fresh produce, meat and seafood, and dairy are.【出自-2015年12月阅读原文】
94、
Since then, packaged, pre-prepared meals have been what's for dinner.【出自-2015年12月阅读原文】
95、
Since fewer than half of Americans say they cook at an intermediate level and only 20% describe their cooking skills as advanced, the crisis is one of confidence.【出自-2015年12月阅读原文】
96、
Should a woman who possessed a small amount of drugs years ago be permanently unable to be licensed as a nurse?These laws are also counterproductive, since they make it harder for people with criminal records to find housing or land a job, two key factors that reduce backsliding.【出自-2015年12月阅读原文】
97、
Since 1977, I have spent much more time abroad than in the United States.【出自-2015年12月听力原文】
98、
A lot has changed since we were last in school.【2017年12月四级真题（第一套）阅读 Section B】
99、
A new study finds that McDonald's posted its slowest drive-through times since this survey was first conducted 15 years ago.【2018年6月四级真题（第一套）听力 Section A】
100、
Around half of ocean heat intake since 1865 has taken place since 1997, researchers report online in Nature Climate Change.【2016年12月四级真题（第二套）阅读 Section A】
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Buffington says he found a soda bottle half-buried in the sand that looked like it had been there since the beginning of time.【2018年6月四级真题（第二套）听力 Section A】
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But Goel and his team sourced the online discussion forum to find all 40,000 questions that had ever been asked since the class was launched.【2019年12月四级真题（第二套）阅读 Section C】
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But this can be chalked up to the excessively high cost of their books—which has increased over 1, 000 percent since 1977.【2019年12月四级真题（第三套）阅读 Section C】
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Emailing the neuroscientist and memory researcher jim McGaugh one day, she claimed that she could recall every day of her life since the age of 12.【2017年6月四级真题（第一套）阅读 Section B】
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Enjoy the snow now, because chances are good that 2014 will be even hotter, perhaps the hottest year since records have been kept.【2015年12月四级真题（第三套）阅读 Section A】
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For men aged 18 to 34, living at home with mom and/or dad has been the dominant living arrangement since 2009.【2019年6月四级真题（第二套）阅读 Section B】
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Generally, young women have had growing success in the paid labor market since 1960 and hence might increasingly be expected to be able to afford to live independently of their parents.【2019年6月四级真题（第二套）阅读 Section B】
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It didn't take long for magazines and documentary filmmakers to come to understand her "total recall", and thanks to the subsequent media interest, a few dozen other subjects including Veise have since come forward and contacted the team at the University【2017年6月四级真题（第一套）阅读 Section B】
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It was the site of a 2006 fire and has remained vacant ever since.【2018年12月四级真题（第二套）听力 Section A】
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Karraker and co-author Kenzie Latham analyzed 20 years of data on 2,717 marriages from a study conducted by Indiana University since 1992.【2019年6月四级真题（第一套）阅读 Section C】
111、
liechtenstein uses the same money as its neighbor Switzerland, but it has been an independent country since the 1860s.【2016年12月四级真题（第二套）听力 Section C】
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Maria McCartney has been in the mobile ice-cream business since 200】
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