名词
中文翻译：Unknown
同义词：
['fasten', 'fasten up', 'fasten down']
例句：
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1. The door was locked fast before we could get in.
门在我们进入之前被锁上了。
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2. She fastened the zipper tightly to keep the bag closed.
她紧紧地拉紧拉链，把包封好。
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3. He fastened down the seat belts for the journey.
他为这次旅行系好了安全带。