utility wax多用蜡utilityn.效用；实用；公用事业（费）；[计]应用程序adj.多效用的；多功能的utility services公用服务事业utility overflow效用外溢性utility seaplane通用水上飞机utility of money货币效用utility function效用函数utility schedule效用表utility operator辅助工utility of moral个体关怀utility - free效用自由utility aircraft通用飞机