before

中文意思

• prep. 在……之前
• conj. 在……之前
• adv. 以前

英文释义

• adv. earlier in time; previously
• adv. at or in the front

例句

1. prep. 在……之前

   Please make sure to arrive at the airport two hours before your flight.

   请务必在航班起飞前两小时到达机场。

2. conj. 在……之前

   You should check all your documents carefully before you submit the application.

   在提交申请之前，你应该仔细检查所有文件。

3. adv. 以前

   The city has changed a lot, and I have never seen this building before.

   这座城市变化很大，我以前从未见过这栋建筑。