名词
中文翻译：空心钥匙
同义词：
['empty key', 'hollow key']
例句：
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1.He found the hollow key in the lock and turned it to open the door.
他在锁里找到了空心钥匙，转动它打开了门。
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2. The old man used an empty key to unlock the door of his house.
老人用一个空钥匙打开了他房子的门。
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3.The thief used a hollow key to break into the safe.
小偷用一个空心钥匙打破了保险箱。