postbox /ˈpəʊstˌbɒks/ (also post box)

• 1. 

  N-COUNT A postbox is a metal box in a public place, where you put letters and small parcels to be collected. They are then sorted and delivered. Compare . 邮箱 [英国英语]

  例：

  And with a trembling hand, he dropped the letters into the postbox.

  他颤抖的手把信投进了邮箱。