名词
中文翻译：钥匙
同义词：
['key', 'keypad', 'password例句：1. The key to solving this problem lies in understanding the underlying principles.（解决这一问题的关键在于理解其背后的原理。）']
例句：
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1. The key to solving this problem lies in understanding the underlying principles.
解决这一问题的关键在于理解其背后的原理。
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2.She entered the room with a key card and was immediately recognized by the security guard.
她带着一张门禁卡进入房间，被保安立即认出。
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3. The password is '1234'.
密码是'1234'。