PO Box /ˈpiː ˌəʊ bɒks/ (also P.O. Box)

• 1. 

  PO Box is used before a number as a kind of address. The Post Office keeps letters addressed to the PO Box until they are collected by the person who has paid for the service. 邮政信箱 (用在数字之前)

  例：

  Send your order and a cheque to PO Box 2855, Sunnyvale 94087.

  将你的订单和支票寄至桑尼维尔市第2855号信箱，邮编94087。