before

before
preposition,conjunction & adverb

during the period of time preceding (a particular event, date, or time)[as prep.][as adv.]
在（某事件、日期或时间）之前
she had to rest before dinner.
她用餐前要休息一下。
the day before yesterday.
前天。
[as conjunction]they lived rough for four days before they were arrested.
他们在度过了艰难的四天后被捕了。
it wasn't long before I had my first bite.
没一会儿我就第一次等到了鱼来咬饵。
his playing days had ended six years before.
他轻松愉快的日子六年前就结束了。
it's never happened to me before.
我以前从未碰到过这种事。
in front of
在…前面，在…面前
[as prep.]Matilda stood before her, panting.
马蒂尔达气喘吁吁地站在她面前。
the patterns swam before her eyes.
各种图案在眼前浮现。
[as adv.]trotting through the city with guards running before and behind.
在卫兵前呼后拥下一路小跑穿过城市。
■[prep.]in front of and required to answer to (a court of law, tribunal, or other authority)
面对（法院、法庭或其他官方机构）并受审
he could be taken before a magistrate for punishment.
他可能会被送到地方法官那里接受处罚。
in preference to; with a higher priority than
（宁愿…）不愿，优先于
[as prep.]rangers are taught to put their horses' comfort before their own.
骑兵被教导关心马匹要胜过关心自己。
a woman who placed duty before all else.
一位视职责高于一切的妇女。
[as conjunction]they would die before they would cooperate with each other.
他们宁死也不愿合作。

语源

Old English beforan (see by, fore),of Germanic origin; related to German bevor

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