unbagvt.把 ... 从袋里倒(或取、放)出来UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unbalanced experiment不平衡实验undifferentiated race未分化型族,未分化种unbutton one's jacketunexploded explosives未爆弹unmasking and masking脱面具和加面具现象undetected error rote漏检误码率, 未检出的差错率undulatory extinction波状消光unenumerated articles(少于贸易中常用单位额度) 零星货物ungentlemanly conduct不正当的行为unconsumable products不可消费的产品