名词
中文翻译：后门入口
同义词：
['entrance', 'exit例句：1. The back entrance is usually locked during the day.（后门通常在白天上锁。）']
例句：
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1. The back entrance is usually locked during the day.
后门通常在白天上锁。
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2.The restaurant has a back entrance that leads to a small alley.
这家餐厅有一个后门，通往一个小巷子。
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3.After entering the building, you must go through the back entrance to reach the main floor.
进入大楼后，你必须通过后门到达主楼。