名词
中文翻译：信箱
同义词：
['mailbox', 'postbox', 'mail slot', 'letter tray']
例句：
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1. The postmandelivers letters to the letter box every day.
邮递员每天把信件投递到信箱。
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2. He put his letters in the letter box and waited for a reply.
他把信放进了信箱，等着回信。
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3. The old lady placed her letters in the letter box on her doorstep.
老妇人把她的信件放在她家门口的信箱里。