Unas乌纳斯
unaabbr.(英国)联合国协会(=United Nations Association)Una.n.尤娜(女子名)
unappeasable hunger难忍的饥饿
unauthorized broker未经认可的经纪人
unaccommodatingnessn.不应允
unassignable pumped[经] 自动抽油井
unaugmented vehicle无增稳系统的飞行器
unattached children不依恋儿童
unattened operation机上无人操作
unalloyed happiness真正的幸福