user account 用戶帳戶，用戶帳號user acceptance testing 用戶驗(yàn)收測試user acceptance letter [管理學(xué)]用戶驗(yàn)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(jià)值；無結(jié)果uselessmouth 吃閑飯的人uselessly adv.徒勞地；無用地useless species [軍事學(xué)]無益種類useless (adj.) useless adj.無用的；無效的usehold 家用usefulness validation [語言學(xué)]有用性驗(yàn)證usefulness of accounting data [經(jīng)濟(jì)學(xué)]會計(jì)數(shù)據(jù)的用途usefulness n.有用，有益，有效usefully adv.有用地，有效地useful-life n.有效期限useful working life [商業(yè)]堪用工作壽命useful work 有效功；[機(jī)][物] 有用功