UNOV维也纳联办
UNOnum.(意大利语)一uno.n.联合国组织(=United Nations Organization)
unobtainable number叫不通的号码
unobserved-windown.撤销观察窗口
unobligated balance不结转的年终预算结余
unobservable system不可观察的系统
unobtainable object无法达到的目标
unorganized fermentn.[生化]离体酶
unoriented migration不定向洄游
unoxidized blowholes[机] 非氧化气孔