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two times; on two occasions 两次；两遍 I don't know him well; I've only met him twice. 我跟他不熟悉，只见过两次面。 The cows are milked twice daily. 奶牛每天挤奶两次。 The cows are milked twice a day. 奶牛一天挤奶两次。 They go there twice a week/month/year. 他们每星期／每月／每年去那里两次。 a twice-monthly/yearly newsletter 半月／半年刊的简讯 He managed to score twice in the match. 他设法在比赛中得了两分。 The book has been turned into film at least twice before. 这本书以前至少被翻拍过两次。
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double in quantity, rate, etc. 两倍 an area twice the size of Wales 两倍于威尔士大小的地区 Cats sleep twice as much as people. 猫睡觉的时间比人长一倍。 At 56 he's twice her age. 他 56 岁，年龄比她大一倍。 Charges have risen at twice the rate of inflation. 费用以两倍于通货膨胀率的速度上涨。
Word Originlate Old English twiges, from the base of two + -s (later respelled -ce to denote the unvoiced sound); compare with once.
Idioms
lightning never strikes (in the same place) twice
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an unusual or unpleasant event is not likely to happen in the same place or to the same people twice 倒霉的事不可能在同一场所（或同一人身上）重复发生；一事不过二
once bitten, twice shy
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after an unpleasant experience you are careful to avoid something similar 一朝被蛇咬，十年怕井绳
once or twice
think twice about something/about doing something
to think carefully before deciding to do something 三思而行；慎重考虑后再决定
twice over