unnel隧道UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unmanageable bundles.笨重的包袱uncontrolled descriptor非控主题词unprofessional accident[法] 违章事故unmanned control system无人控制系统unconventional oil tank非制式油罐Unbalanced Radial Force径向不平衡力unrated gauging station未建立水位-流量关系的测站unbearably interminable冗长不堪Unkanodella ussuriensisn.乌苏里瘤突飞虱Uncontrollable vomiting不可控制性呕吐