unleda.UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西undegraded protein非降解蛋白质unmeasured cations未测定的阳离子unbondedmica paper无结合之母纸unplaned pregnancy非计划妊娠unmanned operation无人操作,无人值班的运行uncompensated heat[化] 未补偿热unbinding contract[法] 无约束力的合同unlicensed driving无证驾车unregistered nurse未注册护士uncertified teachern.代课老师