an

• He rolled his eyes and hit upon an idea .
  他眼珠一转悠就想出个主意。
• I want to search out an old school friend .
  我想寻找我的一个老同学。
• An important principle has been laid down .
  一个重要的原则已被确定。
• Leadership means setting an example .
  领导者的作风意味着要树立榜样。
• She did not so much as raise an eyebrow .
  她甚至连眉毛也不抖动一下。
• Her mother came out of an open door .
  她妈妈从一扇开着的门里走出来。
• The angry mob lynched an innocent man .
  病狂的暴民私刑冶死一名无辜。
• A toom purse makes an oblate merchant .
  口袋一文不名，会使商人烦闷。
• You have not the beginning of an aptitude .
  你却连起码的聪明也没有。
• As an elderly figure he seemed conservative .
  晚年他似乎保守起来了。