UnPBXn.基于Windows NT和Unix的电话服务器UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unutilized population未利用种群unconstrained problem无约束问题unclassified specimen不分类的样品unbalanced food chain不平衡食物链unramified projection非分歧射影unbounded prestressed无粘结预应力unbalanced load meter不平衡负载表uncus gyri hippocampi海马回钩, 钩回unconverged blue spot失聚蓝荧光点unpublished materials未发表的资料