UNFF联合国森林论坛UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unneighborlinessn.不睦邻；无邻居情谊的状态unthoughtfulnessn.欠考虑；轻率undistored power不失真功率unreduced gamete不减数配子unbalanced state不平衡状态untrimmed timber未去皮木材ungoverned'twixtuncallable bonds不可提前收回的公司债undefended cause无辩护的讼因unramified field非分歧域