名词
中文翻译：门的关闭器
同义词：
['door lock', 'doorlatch']
例句：
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1.The door closer is a small device thatcloses the door automatically when you openit.
门的关闭器是一个小型装置，当你打开门时会自动关闭。
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2. The doorcloser was designed to prevent people from openingthe door without permission.
门的关闭器被设计用来防止未经允许的人打开门。
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3.The door closer has been replaced with amore efficient and user-friendly design.
门的关闭器已经被更高效和用户友好的设计所取代。