mustn't needn't
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mustn''tneedn''tmustn''tneedn''tmustn''tneedn''tmustn''t----------------不准,不许可needn''t---------------不必mustn
mustn't needn't
mustn't needn't
mustn't needn't
mustn't----------------不准,不许可
needn't ---------------不必
mustn't 不准
needn't 不必
mustn't 不准 ，禁止 needn't 不必，不需要
mustn't不可以，不允许，不准
needn't不必，不用