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when
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音标：英 [wen] 美 [wɛn]
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解释：
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conj. 考虑到；既然；当…时；在…时；如果
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adv. 什么时候，何时；（用于时间的表达方式之后）在那时；其时；当时
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pron. 那时；什么时侯
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n. 时间，时候；日期；场合
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中文词源：
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when 什么时候来自PIE*kwo,印欧语疑问代词根，词源同who,where,why,how.
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英文词源：
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when
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when: [OE] When was formed from the ancient interrogative base *qwo- (source also of English what, who, etc) and a nasal suffix which also appears in then. From the same ancestor, but with an additional dental suffix, came Latin quando ‘when’, source of English quandary.
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=> quandary
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when (adv.)
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Old English hwænne, hwenne, hwonne, from Proto-Germanic *hwan- (cognates: Old Saxon hwan, Old Frisian hwenne, Middle Dutch wan, Old High German hwanne, German wann "when," wenn "if, whenever"), from pronominal stem *hwa-, from PIE interrogative base *kwo- (see who). Equivalent to Latin quom, cum. As a conjunction in late Old English. Say when "tell me when to stop pouring you this drink" is from 1889.
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双语例句：
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1. The best thing to do when entering unknown territory is smile.
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踏入未知地带最好的对策就是微笑。
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来自美剧《凯莉日记》
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2. When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.
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当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。
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来自
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3. Good luck is when an opportunity comes along and you're prepared for it.
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好运就是当机会来临时，你早已做好了准备。
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来自金山词霸 每日一句
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4. If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre
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如果你独处时感到寂寞，说明没有把自己陪好。
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来自金山词霸 每日一句
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5. The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.
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当你从内心深处找到一种可以忍受一切痛苦的坚强力量时，你的成长历程就会出现飞跃。
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来自金山词霸 每日一句
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更多相关例句：
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When did you last see him?
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你上次什么时候见到他的？【牛津词典】
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When can I see you?
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我什么时候可以见你？【牛津词典】
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When (= in what circumstances) would such a solution be possible?
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什么情况下可以这么解决？【牛津词典】
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Sunday is the only day when I can relax.
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星期日是我唯一可以休息的日子。【牛津词典】
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There are times when I wonder why I do this job.
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有时候我也不明白自己为什么要干这个工作。【牛津词典】
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The last time I went to Scotland was in May, when the weather was beautiful.
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我上次去苏格兰是在五月份，那时的天气好极了。【牛津词典】
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Until when can you stay?
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你可以待到什么时候？【牛津词典】
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‘I've got a new job. ’ ‘Since when? ’
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“我有了份新工作。”“什么时候开始的？”【牛津词典】
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I loved history when I was at school.
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我上学时喜欢历史。【牛津词典】
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Call me when you've finished.
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你完成后就打电话给我。【牛津词典】
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Can you spare five minutes when it's convenient?
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方便时能占用你五分钟时间吗？【牛津词典】
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He had just drifted off to sleep when the phone rang.
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他刚睡着电话铃就响了。【牛津词典】
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How can they expect to learn anything when they never listen?
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既然他们从不听讲，他们怎么能指望学到东西呢？【牛津词典】
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She claimed to be 18, when I know she's only 16.
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她自称是18岁，可是我知道她才16。【牛津词典】
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When are you going home?...
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你什么时候回家？【柯林斯高阶英语词典】
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When did you get married?...
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你什么时候结的婚？【柯林斯高阶英语词典】
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When eating a whole cooked fish, you should never turn it over to get at the flesh on the other side...
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吃一整条鱼时，切忌把它翻过来去吃另一面的肉。【柯林斯高阶英语词典】
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Mustard is grown in the field when weeds are there, rather than when the growing crops are there.
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芥菜要在地里长杂草而不是长庄稼时种植。【柯林斯高阶英语词典】
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When I met the Gills, I had been gardening for nearly ten years.
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遇到吉尔一家时我已经做了近10年的园艺工作。【柯林斯高阶英语词典】
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When he brought Imelda her drink she gave him a genuine, sweet smile of thanks...
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当他把饮料拿给艾梅尔达时，她真诚而甜美地向他微笑以示感谢。【柯林斯高阶英语词典】
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I'll start to think about it when I have to write my report.
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我要写报告时会对此予以考虑的。【柯林斯高阶英语词典】
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I asked him when he'd be back to pick me up...
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我问他什么时候回来接我。【柯林斯高阶英语词典】
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I don't know when the decision was made...
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我不知道决定是什么时候作出的。【柯林斯高阶英语词典】
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He could remember a time when he had worked like that himself...
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他还能记得自己一度工作起来也是那个样子。【柯林斯高阶英语词典】
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She remembered clearly that day when she'd gone exploring the rockpools...
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她清楚地记得她去岩石区潮水潭探险的那天。【柯林斯高阶英语词典】
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How can I love myself when I look like this?...
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我这个样子，怎么能对自己满意呢？【柯林斯高阶英语词典】
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Emerald starlings are fairly small when compared with other such birds.
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与同类的其他鸟相比，翠辉椋鸟要小很多。【柯林斯高阶英语词典】
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Our mothers sat us down to read and paint, when all we really wanted to do was to make a mess...
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我们的母亲让我们坐下来读书和画画，而我们真正想做的却是打打闹闹。【柯林斯高阶英语词典】
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The temperature sensor is making the computer think the engine is cold when, in fact, it's hot.
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温度传感器发给计算机的信息为发动机是冷却的，可实际上它的温度很高。【柯林斯高阶英语词典】
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While consumers are spending less on toilet paper, they remain fussy – in theory at least – when it comes to paper quality.【出自-2017年6月阅读原文】
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When you can quote a specific number like a fifth of the patients were able to quit, that's compelling.【出自-2017年6月阅读原文】
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When we acquire new information, the brain automatically tries to incorporate ( ' , 合并) it within existing information by forming associations.【出自-2017年6月阅读原文】
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When people tend to forget.【出自-2017年6月阅读原文】
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When it's time to make the leap, they take action and immediately drop what's no longer serving their purpose.【出自-2017年6月阅读原文】
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When Leah made the commitment to change, she primed herself to new opportunities she may otherwise have overlooked.【出自-2017年6月阅读原文】
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Veiseh can even put a date on when those tapes started recording: 15 December 2000, when he met his first girlfriend at his best friend's 16th birthday party.【出自-2017年6月阅读原文】
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This is hard to achieve when, as is now the case in many big firms, a large proportion of staff are temporary contractors.【出自-2017年6月阅读原文】
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These extra features are deemed unnecessary by the majority of shoppers, which probably reflects how these types of products are typically more expensive than regular toilet paper, even when on special offer.【出自-2017年6月阅读原文】
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The late Richard Hackman of Harvard University once argued, I have no question that when you have a team, the possibility exists that it will generate magic, producing something extraordinary… But don't count on it.【出自-2017年6月阅读原文】
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Teamwork is most effective when team members share the same culture.【出自-2017年6月阅读原文】
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People with HSAM have the same memory as ordinary people when it comes to impersonal information.【出自-2017年6月阅读原文】
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One of the reasons I find this topic very interesting is because my mom was a smoker when I was younger, says Lindson-Hawley, who studies tobacco and health at the University of Oxford.【出自-2017年6月阅读原文】
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Leah reflects on one incident that triggered her fears, when her investors threatened to shut her down: I was probably up against the most fear I've ever had, she says.【出自-2017年6月阅读原文】
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It's the stage in the middle of the journey when people feel youth vanishing, their prospects narrowing and death approaching.【出自-2017年6月阅读原文】
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Environmental protection is not much of a concern when Britons buy toilet paper.【出自-2017年6月阅读原文】
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Either way, we have choices about how we respond to it when it comes.【出自-2017年6月阅读原文】
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And when we retrieve ( ' , 检索) information, both the desired and associated but irrelevant information is recalled.【出自-2017年6月阅读原文】
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A young woman sought explanation from a brain scientist when she noticed her unusual memory.【出自-2017年6月阅读原文】
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Zircle reported the attack when she arrived in Nulato, Alaska, in the early hours of the morning.【出自-2017年6月听力原文】
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Whenever she called her parents or other relatives, she always had to think about the time difference so that she wouldn’t wake someone up or call when she knew they were at church.【出自-2017年6月听力原文】
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When he looked closer he realized it was a huge group of bees.【出自-2017年6月听力原文】
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When dogs looked at expressions of angry dogs, their eyes rested more on the mouth, perhaps to interpret the threatening expressions.【出自-2017年6月听力原文】
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When Katherine joined Facebook, some of her classmates at high school started to add her as a friend.【出自-2017年6月听力原文】
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Thousands of bees left a town after landing on the back of a car when their queen got stuck in its boot.【出自-2017年6月听力原文】
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She loved learning about the success of people she knew when she was just a teenager.【出自-2017年6月听力原文】
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If I could go back in history and live when I liked, I wouldn’t go back very far.【出自-2017年6月听力原文】
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His teacher said if he went on like that, his face would get stuck when the winds changed.【出自-2017年6月听力原文】
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Hi, Susan! You’re looking very smart today! There is new data out today that confirms that many Americans are not good at math, and when it comes to everyday technology skills, we are dead last when compare to other developed countries.【出自-2017年6月听力原文】
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But carrots got their biggest boost during the two world wars when food shortages forced people to eat them and governments told everyone how healthy carrots were.【出自-2017年6月听力原文】
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Another thing Katherine loved about Facebook was that she didn’t have to think about time zones when updating family.【出自-2017年6月听力原文】
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And when looking at angry humans, they tended to turn away their gaze.【出自-2017年6月听力原文】
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Advocates of selfdriving cars argue they will be safer than in cars driven by humans because they wouldn’t get distracted or drive when tired.【出自-2017年6月听力原文】
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When your elderly rel】
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