Unal于纳尔unaabbr.(英国)联合国协会(=United Nations Association)Una.n.尤娜(女子名)unaccount for未说明unassertivelyadv.不断言地；谨慎地unambitiouslyadv.无奢望地unanticipatedadj.不曾预料到的Unachionaspis伪长盾蚧属unadaptednessn.未改变unacceleratedadj.未加速的Unaspis sp.融杀蚧螨unapprehendedadj.未被理解的unascertainedadj.未查明的；未弄清的；未经确定的