uncladj.不分类的(不保密的)UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西uncowled engine无整流罩发动机unbraced frames纯框架unlead gasoline无铅汽油Uncharged Eject未装弹药的射击unexceptionableadj.〈正式或文〉无可挑剔的；无可指责的unbounded fluid无界流体unwedded mother未婚母亲uncapping plane割(蜜)盖刀uncolored cloth无色布un-free water非自由水