UNCF=United Nations Children's Fund 联合国儿童基金
UNabbr.(=United Nations) 联合国pron.<口>人,事物,家伙,东西
uncollided neutron未碰撞中子
unconformity event不整合事件
unmanageable child难管教儿童
undivided interest未分配利益
unbosom themselvesvi.吐露心事
unfavorable answer否定的回答
unfavorable allele不被接受等位基因
unheated air drier常温气流干燥机
unbecoming conduct不恰当的行为
"decrepit, colorless uneager things"