• 留下痕迹

leavern.离开的人(常指学校毕业生)leavev.委托；离开；留给；遗留；遗赠；听任n.许可；准假；告别vi.生出叶子leave ... to交托, 委托leave this subject丢开这个题目leave sth as it is听任某事自然发展leave from station离开车站leave it unsettled不了了之leave one's family抛弃家庭,离家出走leave enough alone不要画蛇添足, 不要多事leave it somewhere将它遗忘在某处Leave him there.别管他.leave it to chance听任命运, 任其自然

1. The water left a mark on the silk dress.
   水致使她的裙子留下痕迹。
2. Why do airplanes sometimes leave contrails behind?
   为什么飞机有时会留下痕迹呢？