UNFF联合国森林论坛
UNabbr.(=United Nations) 联合国pron.<口>人,事物,家伙,东西
unpunched gasket无孔密封垫
unfragment files非裂化文件
unmatured coupon未到期息票
unmanageablenessn.不可控性;难操控性
undulating grade起伏坡度
unpadded plaster无衬石膏
undulation light脉动光
unbounded medium无界媒质
unbalance weight不等重
unnamed contract无名合同