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                He once emerged from the toilets with his flies unfastened.有一次他裤链没拉就出了厕所。The buttons came unfastened.扣子松开了.He unfastened the buttons of his shirt.他解开了衬衣纽扣.... 
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                v.解开(尤指衣服或带子)( unfasten的过去式和过去分词 ),松开,解开,脱开,松开... 
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                He unfastened the buttons of his shirt.他解开了衬衣纽扣.He once emerged from the toilets with his flies unfastened.有一次他裤链没拉就出了厕所。The buttons came unfastened.扣子松开了.Reaching down, he unfastened the latch on the gate...他伸手打开了门闩。...