twice

adv.

1. 两次；两遍
   two times; on two occasions
   1. I don't know him well; I've only met him twice.
      我跟他不熟悉，只见过两次面。
   2. They go there twice a week/month/year .
      他们每星期 / 每月 / 每年去那里两次。
   3. a twice-monthly/yearly newsletter
      半月 / 半年刊的简讯
2. 两倍
   double in quantity, rate, etc.
   1. an area twice the size of Wales
      两倍于威尔士大小的地区
   2. Cats sleep twice as much as people.
      猫睡觉的时间比人长一倍。
   3. At 56 he's twice her age.
      他56岁，年龄比她大一倍。

1. ADV 两次
   If something happens twice, there are two actions or events of the same kind.
   1. He visited me twice that fall and called me on the telephone often...
      那年秋天他来看过我两次，而且经常给我打电话。
   2. The government has twice declined to back the scheme…
      政府已两次拒绝支持该方案。
   3. Thoroughly brush teeth and gums twice daily...
      每天两次彻底刷净牙齿和牙龈。
   4. Twice before he had been in New York with Gladys on summer vacations.
      他之前已经和格拉迪丝两次来到纽约度暑假。
   5. …Foster, who is twice the world champion.
      两次获世界冠军的福斯特
2. ADV (表示频率)每天两次/一周两次
   You use twice in expressions such as twice a day and twice a week to indicate that two events or actions of the same kind happen in each day or week.
   1. I phoned twice a day, leaving messages with his wife...
      我每天打两次电话，托他妻子捎口信。
   2. This famous horse race has taken place here twice a year since 1310.
      这一著名的赛马比赛自 1310 年以来每年在这里举行两次。
3. ADV 两倍;强(或好、难)得多
   If one thing is, for example, twice as big or old as another, the first thing is two times as big or old as the second. People sometimes say that one thing is twice as good or hard as another when they want to emphasize that the first thing is much better or harder than the second.
   1. The figure of seventy-million pounds was twice as big as expected.
      7,000 万英镑的金额是预期的两倍。
   2. …a report claiming that teachers could be twice as effective if they returned to traditional classroom methods.
      声称教师若重新采用传统课堂讲授方法，授课效果会事半功倍的报告
   3. Twice is also a predeterminer.
      
   4. Unemployment in Northern Ireland is twice the national average...
      北爱尔兰的失业率是全国平均水平的两倍。
   5. Double cream contains approximately twice the quantity of fat-soluble vitamins as single cream.
      高脂厚奶油中脂溶性维生素的含量大约是稀奶油的两倍。
4. PHRASE 重新考虑;慎重考虑;思忖再三
   If you think twice about doing something, you consider it again and decide not to do it, or decide to do it differently.
   1. She'd better shut her mouth and from now on think twice before saying stupid things.
      她最好闭上嘴巴，而且今后在说出蠢话之前先过过脑子。
5. once or twice → see: once

1. Although he was twice as old as us, he became the life and soul of the company.
   虽然他的年纪是我们的两倍，但他却成为了公司的灵魂人物。
2. She's backpedaled twice already
   她已经两次变卦了。
3. It would be a good idea if you could do this exercise twice or three times on separate days.
   如果你能将此练习隔几天做上两三次就好了。
4. Carlson noticed another oddity; his plant had bloomed twice.
   卡尔森注意到另外一件怪事：他的植物开了两次花。
5. I popped my head round the door once or twice
   我有几次头撞到了门上。
6. Twice his colleagues have outvoted him.
   他的同事已经两次否决了他的建议。
7. He had to have everything spelled out twice over for him.
   他不得不把所有事项都对他详细说明了两次。
8. She took twice the prescribed dose of sleeping tablets
   她服用了双倍医嘱剂量的安眠药片。
9. They are in twice daily radio contact with the rebel leader.
   他们每天用无线电和叛军首领联系两次。
10. He kissed me twice and I realized suddenly that I felt warm and safe.
    他吻了我两次，我突然意识到自己觉得很温暖、很安全。
11. He visited me twice that fall and called me on the telephone often
    那年秋天他来看过我两次，而且经常给我打电话。
12. The government has twice declined to back the scheme
    政府已两次拒绝支持该方案。
13. Thoroughly brush teeth and gums twice daily
    每天两次彻底刷净牙齿和牙龈。
14. Twice before he had been in New York with Gladys on summer vacations.
    他之前已经和格拉迪丝两次来到纽约度暑假。
15. Foster, who is twice the world champion.
    两次获世界冠军的福斯特
16. I phoned twice a day, leaving messages with his wife
    我每天打两次电话，托他妻子捎口信。
17. This famous horse race has taken place here twice a year since 1310.
    这一著名的赛马比赛自1310年以来每年在这里举行两次。
18. The figure of seventy-million pounds was twice as big as expected.
    7,000万英镑的金额是预期的两倍。
19. a report claiming that teachers could be twice as effective if they returned to traditional classroom methods.
    声称教师若重新采用传统课堂讲授方法，授课效果会事半功倍的报告
20. She'd better shut her mouth and from now on think twice before saying stupid things.
    她最好闭上嘴巴，而且今后在说出蠢话之前先过过脑子。
21. I have been to Dalian twice.
    大连我去过两回。
22. I called him twice.
    我喊了他两声。
23. I woke up twice in the night.
    我夜里醒过两次。
24. This room is twice the size of that one.
    这间屋子有那间两个大。
25. You must think twice before you take this step.
    你在走这一步之前，应当三思。
26. You shall not serve me that trick twice.
    不许你再像那样捉弄我了。
27. The fields have been ploughed twice.
    地已犁了两遍。
28. He beats the gong twice.
    他筛了两下锣。
29. I must think twice before I can promise.
    在我答应之前，我必须重新考虑一下。

adv.

twice over

• 不止一次，而是两次
  not just once but twice
  1. 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。

lightning never strikes (in the same place) 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
  an unusual or unpleasant event is not likely to happen in the same place or to the same people twice

once bitten, twice shy

• 一朝被蛇咬，十年怕井绳
  after an unpleasant experience you are careful to avoid sth similar

think twice about sth/about doing sth

• 三思而行；慎重考虑后再决定
  to think carefully before deciding to do sth
  1. You should think twice about employing someone you've never met.
     雇用素不相识的人应三思而行。

adv

1. two times
   1. I called her twice

2. to double the degree
   1. she was doubly rewarded
   2. his eyes were double bright

   Synonym:    doublydouble