重要

before

🇬🇧/bɪˈfɔː(r)/ 🇺🇸/bɪˈfɔːr/📚 219 5中考高考

If something happens before a particular date, time, or event, it happens earlier than that date, time, or event. ^{在 (某日、某时、某事件) 以前}

preposition [位置和方向]（时间上）在…之前，早于；在（某个钟点）之前；（次序）在…之前；当面，在…面前；由…考虑中；面对（法院，法庭或其他官方机构）并受审；比…更重要；（位置）在…前面；（未来将发生的事）等待着，面临着；（宁可…而）不愿…；在…影响下，在…威慑下

If you do one thing before doing something else, you do it earlier than the other thing.
在 (做某事) 之前 • He spent his early life in Sri Lanka before moving to Canada.

conjunction [推进连词]在…以前；到…为止；以免，不然；（先）…才…；（宁可…而）不愿

Stock prices have climbed close to the peak they'd registered before the stock market crashed in 1987.
股票价格已经快爬升到了1987年股市崩溃前的最高纪录。

adverb [时间副词]以前，过去；在（某时间或某事）以前；在前面

You use before when you are talking about time. For example, if something happened the day before a particular date or event, it happened during the previous day.
(某时、某事) 以前

be- 构成动词，表示"使…成为";构成一些介词before prep. 在前面（be+fore 前面）