剑桥词典a large piece of card , paper , etc. with a message written or printed on it, often carried in public places by people who are complaining about something 布告；标语牌 Demonstrators marched past holding /waving placards that said "Send food , not missiles !" 示威者举着／挥动着标语牌游行，上面写着“要食物，不要导弹”。 返回 placard