uncapv.脱掉帽子；打开盖UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unpolarizable electrode不极化电极unregistered prostitute暗娼undisturbed soil sample未扰动试样unremittance of control控制的不间断性unprotected system file非保护系统文件Unpaired Purchase Order单方面(不成双)购买订单unclaimed animal corpse无人认领鸟兽尸体unmanned aerial vehicle无人驾驶飞机unnamed control section无名控制段untreated-gravel road未经粘合料处理的砾石路