介词短语
中文翻译：在某人之前
同义词：
['ahead of', 'beforehand', 'prior to例句：1. She decided to go home before the rain started.（她决定在雨开始之前回家。）']
例句：
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1. She decided to go home before the rain started.
她决定在雨开始之前回家。
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2.The project was completed before the deadline.
这个项目在截止日期之前完成了。
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3.I arrived at the airport before my flight took off.
我在我的航班起飞前到达了机场。