Unell于内尔UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西uncutting wiping towel毛边抹布unburden oneself to sb向某人倾诉衷情un- cognition factor非认知因素unpunched litho master带非穿孔冲头uncorrelated increment不相关增量Unguided Aerial Rocket无制导航空火箭undisturbed one output无干扰输出unelasticity collision非弹性碰撞Unfinanced Requirement无资金来源的需求unconditioned stimulus无条件刺激,无条件剌激,非条件刺激物