postbox
Longman Dictionary of Contemporary English 5++LDOCE 5++ldoce_268_apost·box /ˈpəʊstbɒks $ ˈpoʊstbɑːks/ noun [countable] British English 
TCMa box in a public place, into which you put letters that you want to send 邮箱，邮筒 SYN British English letterbox, American English mailbox
TCMa box in a public place, into which you put letters that you want to send 邮箱，邮筒 SYN British English letterbox, American English mailboxExamples from the Corpus
postbox• It hit a postbox before ploughing into the wall.• To the left of the doorway is the first postbox in Milan, dating back to the Napoleonic era.• He raised it, threw it over the small postbox gate.• As mummy stepped out of the car park, tugging Anna's arm even though she was hurrying, she turned away from the postbox.• Madeleine gave her a quick kiss, then tossed her the postbox keys.• Secure on to the front of the postbox.post·box nounChineseSyllable
place, box Corpus public a in which a into you
postbox
post‧box /ˈpəʊstbɒks $ ˈpoʊstbɑːks/
noun [countable] British English
a box in a public place, into which you put letters that you want to send
SYN letterbox British English, mailbox American English
post‧box /ˈpəʊstbɒks $ ˈpoʊstbɑːks/
noun [countable] British Englisha box in a public place, into which you put letters that you want to send
SYN letterbox British English, mailbox American English
both
