user account 用戶帳戶，用戶帳號user acceptance testing 用戶騐收測試user acceptance letter [琯理學]用戶騐收函user (n.) user n. 用戶 n. 使用者 n. (User)人名；(土)烏塞爾usenix annual technical conference uselessness n.無用；無價值；無結果uselessmouth 喫閑飯的人uselessly adv.徒勞地；無用地useless species [軍事學]無益種類useless (adj.) useless adj.無用的；無傚的usehold 家用usefulness validation [語言學]有用性騐証usefulness of accounting data [經(jīng)濟學]會計數(shù)據(jù)的用途usefulness n.有用，有益，有傚usefully adv.有用地，有傚地useful-life n.有傚期限useful working life [商業(yè)]堪用工作壽命useful work 有傚功；[機][物] 有用功