Unell于内尔
UNabbr.(=United Nations) 联合国pron.<口>人,事物,家伙,东西
undifferentiated curve无差异曲线
uncollected commission[经] 未收佣金
unknowing aid to enemy无知的[自己不知道的]利敌行为
undistributed earnings[经] 未分配盈余(收益)
unweighted noise level未加权噪声电平
unthreaded round drill无螺纹钻头
unmaned aerial vehicle无人机
unbalance compensation不平衡补偿
uncompleted production在产品
unmatched in the world天下独步