unmixv.(使)不混合(使)无法混合.UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西undepreciated cost未提折旧成本unmanned spaceship无人飞船unban rail transit城市轨道交通Untica mairei Levl滇藏荨麻unexplained puzzle不解之迷unfrequent inquiry非经常性调查uncrossed diplopia非交叉性复视uncrossed parallax非交叉性视差unregistered share无记名股票uncollectible debt坏账； 味道账