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副词
adv. 从那时以来
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from then until now
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I saw him in June,but we haven't met since.
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我在六月见到过他，从那以后我们未见过面。
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He has looked for a job ever since.
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他打那一直在找工作。
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副词
adv. 过去至现在的一段时间
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at the same time between then and now
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Mr. Li was ill last week but has since recovered.
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李先生上星期病了，后来就痊愈了。
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副词
adv. 以前；在现在以前
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ago; before now
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The word has long since been out of use.
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此字老早以前就无人使用了。
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ever since
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从那时起一直到现在
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Jack went to Canada in 1974 and has lived there ever since.
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杰克于一九七四年去加拿大，从那时起到现在一直住在那里。
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连词
conj. 从…以来；…以后
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from the time when
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What have you been doing since I saw you last?
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自从我上次看到你以来，你做什么了？
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He has been in the army since he left school.
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他离开学校以来一直在部队里。
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He has devoted himself to teaching since he graduated from the college in 1962.
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他一九六二年大学毕业以后一直献身教学工作。
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连词
conj. 因为；既然
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because; as
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Since I have no money, I can't buy any food.
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因为我没钱，所以不能买任何食品。
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We don't know much about the appearance of the surface of Antarctica, since it is covered with ice more than two miles thick in some places.
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我们对南极洲的地面形状了解不多，因为在这个洲有些地面覆盖着两英里多厚的冰层。
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Since we're League members, we should set a good example to others.
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即然我们是团员，我们就应该给别人做个好榜样。
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Since we have no money, it's no good thinking about a holiday.
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既然我们没有钱，考虑度假有什么用。
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介词
prep. 从…以来；自从
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in all the time after
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She has been ill since last Sunday.
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上星期日以来，她一直在生病。
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He has eaten nothing since yesterday.
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自从昨天以来他没吃过东西。
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Since my last letter I have heard from him twice.
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自从我上次写信给他以后，我已经收到他两封信了。
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