名词
中文翻译：后门
同义词：
['entrance', 'exit', 'passage']
例句：
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1. The back door was unlocked and I could easily sneak in.
后门是开着的，我很容易就能溜进去。
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2. He kept his secret by using a back door.
他通过一个秘密通道来保持他的机密。
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3. She opened the back door to let the fresh air in.
她打开后门让新鲜空气进来。