before
先───before
He paused before answering.───他在回答前停了下来。
Be sure to bar all the doors before you leave.───在离开前,务必把所有的门都闩上.
Before trying to tackle his homework he read up the notes he had taken at the lecture.───他把课堂上记的笔记认真看过后才动手做作业.
A vast expanse of golden crops lay before us.───我们眼前展现出一大片金黄色的庄稼.
Cranes take from four to seven years to mature before they pair up.───鹤要4至7岁才成熟交配.
Jim appeared a few minutes before the end of the party.───吉姆在晚会结束前几分钟才露面.
He kicked around a good deal before settling down.───他在定居前一直在东奔西走.
Look before you leap.───三思而后行.