名词
中文翻译：钥匙
同义词：
['keystone', 'keyhole', 'pivot']
例句：
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1. The lock on the door is a key to the room.
门锁是通往房间的钥匙。
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2. The key to solving this problem lies in understanding the underlying principles.
解决这个问题的关键在于理解其背后的原理。
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3. He used the key to unlock the safe and retrieved his documents.
他用钥匙打开了保险箱，取出了他的文件。