1 N-COUNT (户外的)信箱 A mailbox is a box outside your house where your letters are delivered. (户外的)信箱 [US]
2 N-COUNT 公共邮箱;公用邮筒 A mailbox is a metal box in a public place, where you put letters and packets to be collected. They are then sorted and delivered. 公共邮箱;公用邮筒 [mainly US]
in BRIT, use 英国英语用 post box
3 N-COUNT [usually singular] 电子信箱 On a computer, your mailbox is the file where your e-mail is stored. 电子信箱
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