may not是委婉地说不用这么做,很客气很礼貌.有种为他人着想的含义在里面.
mustn't是强硬地绝对不可以,坚决不行,没有商量的余地.比如：
You may not need this.
你可能不需要这个.
You mustn't sit there.
你绝对不能坐那儿.
may not与mustn't的区别?
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