twice

adverb

/twaɪs/

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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。
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

(saying) 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

(saying) after an unpleasant experience you are careful to avoid something similar一朝被蛇咬，十年怕井绳

once or twice

a few times一两次；几次
- I don't know her well, I've only met her once or twice.我跟她不很熟，我只见过她一两次。

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
- You should think twice about employing someone you've never met.雇用素不相识的人应三思而行。
Topics Preferences and decisionsc1

twice over

not just once but twice不只一次，而是两次
- There was enough of the drug in her stomach to kill her twice over.她胃中的药物足够毒死她两次的。