post office box
英式
- a numbered box in a post office assigned to a person or organization, where letters for them are kept until called for.
noun: post office box, plural noun: post office boxes
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- IPA[ˈpoʊst ˌɔfəs ˌbɑks]
美式
- a numbered box in a post office assigned to a person or organization, where mail for them is ...
Oxford American Dictionary