pillar-box red鲜红的
letterbox mailbox pillar-box邮局设置的供人投寄信件的箱子
drop into a pillar-box投寄信件
post-box pillar-box设在路旁供寄信用的柱墩状箱
N（名词） (in Britain) a red pillar-shaped public letter box situated on a pavement 邮筒
ADJ（形容词） characteristic of a pillar box (in the phrase pillar-box red) 鲜红的