名词
中文翻译：单门
同义词：
['solitary gate', 'solitary door']
例句：
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1. The single gate is locked fromthe inside.
这个单独的门从里面锁上了。
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2. The old house has a single gateleading to the backyard.
这所老房子有一个单独的门通向后院。
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3. The singlegate was closed for maintenance.
那个单独的门因为维护而关闭了。