a distensible membranous sac (usually containing liquid or gas)
同义词：bladder
vesica详细解释
ve.si.ca n.（名词）【复数】ve.si.cae[-kô, -sô] A bladder, especially the urinary bladder or the gallbladder.膀胱，泡，囊：膀胱，尤指泌尿器官的膀胱或胆囊 来源：Latin vôsoca 拉丁语 vôsoca 【引伸】 ves.ical
