n.邮筒，信箱
An old mailbox has been padlocked shut.
一个旧信箱被挂锁锁着。
He stuck down the envelope and dropped it into the mailbox.
他把信封粘好后便投进邮筒.
He stopped at the mailbox and dropped the letter in.
他在邮筒前停了下来,把信投了进去.
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