剑桥词典short form of must not （must not的縮略形式） You mustn't worry too much about this. 你不必對此太擔心。 例句 You mustn't go into the garden .Tell them they mustn't make too much noise .You mustn't leave litter lying around.I mustn't forget my keys .She mustn't feel she has to pay . 返回 mustn't