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
undisputed leader公认的领袖
unnormal activity不规范行为
unmortaged assets非抵押资产
unbalanced moment不平衡力矩
unbend one's mind
uncoursed masonry不成层圬工
unfertilized ovum未受精卵
Unelected section“压不死”区段
unfavorable group弱势群体
unencumbered post待补员额