名词
中文翻译：主标记特征同义词
同义词：
['master key', 'master key feature']
例句：
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1. The master key unlocked the safe with ease.
主钥匙轻松地打开了保险箱。
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2. The master key is used to open all the locks in the house.
主钥匙用来打开房子里所有的锁。
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3. The master key is kept in a safe place to prevent theft.
主钥匙被妥善保管，以防盗窃。