unifixn.卸下；解开UNIabbr.印度联合新闻社(=United News of India)unidentifiable howling noises无法辨认的号叫声Unidentified Submarine Object不明水下目标Unified Modeling Language UML统一建模语言UMLunified status authentication统一身份认证unipolar-bipolar conversion单极-双极变换Uninstall or change a program卸载或更改程序unified power flow controller统一潮流控制器unidirectional characteristic单向特性unification of man and nature天人合一unidimensional chromatography单向色谱法