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