Unas乌纳斯unaabbr.(英国)联合国协会(=United Nations Association)Una.n.尤娜(女子名)unamortized expenses[经] 未摊还费用unauthorized version未经官方认可的版本unanticipated action料想不到的作用unaccompanied chorus无伴奏合唱unauthorized vehicle未经审验许可使用的车辆unauthorized absence擅离职守; 擅自缺勤unattached institute独立学院unalterable resolves坚定不移的决心unattended operation无人照管运行,无人值班的运行unacknowledged frame未确认帧