1. think twice
   重新考虑,在想一想;犹豫,踌躇
   

1. This kind of film is twice thinner than ordinary paper.
   这种薄膜的厚度只及普通纸的一半。
2. The company has promoted her twice in the last two years.
   公司在去年提升了她二次。
3. The winner polled twice as many votes as his opponent.
   获胜者获得了比对手多一倍的选票。
4. The lighthouse flashes signals twice a minute.
   灯塔每分钟发出两次信号。
5. A dentist inspects the pupil's teeth twice a year.
   一位牙医一年两次为那个小学生检查牙齿。

　2个副词解释