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； 英英释义： unfastened[ ,ʌn'fɑ:sən, -'fæ- ]adj.not closed or secured"the car door was unfastened"; "unfastened seatbelts"affording unobstructed entrance and exit; not shut or closed同义词：opennot buttoned同义词：unbutton