名词
中文翻译：Unknown
同义词：
['door frame', 'door frame', 'doorcasing']
例句：
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1.The door was made of wood and hada wooden door shell.
这扇门是用木头做的，有一个木制的门框。
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2. The door shell is designed to keepthe door closed.
门壳的设计是为了保持门关闭。
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3. The door shell is madeof metal and has a lock on it.
门壳是由金属制成的，上面有一个锁。