twice

• To ensure a good crop the soil had to be turned over twice .
  要保证收成好，地要翻耕两遍。
• The boat has bottomed twice on this shallow stretch .
  这艘船在这条浅水道上已经搁浅两次了。
• I have been to dalian twice .
  大连我去过两回。
• Once bitten, twice shy .
  一次被咬，二次胆小。
• Six into twelve goes twice .
  六除十二得二。
• Twice two is equal to four .
  两个二等于四。
• We stumbled once or twice but we got there quite quickly .
  我们绊了一两跤，但很快就到了那儿。
• Mrs. corney twice essayed to speak, and twice failed .
  考尔尼太太两次试图启齿，两次都没有成功。