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BNC: 8593 COCA: 9891
usefulness
noun [U] /ˈjuːsf(ə)lnəs/
  1. the fact of being useful, or the ability to be useful in particular situations 有用;能用

    I'm not sure about the usefulness of her observations. 我拿不准她的观察是否有用。

    outlive its usefulness (=no longer be useful) 不再有用 :

    Many people think the system has outlived its usefulness. 许多人认为该系统已经不再有用了。

     Synonyms and related words
    Usefulness and efficiency: usefulness, efficiency, effectiveness...
BNC: 8593 COCA: 9891
usefulness

noun

ADJECTIVE | VERB + USEFULNESS | PREPOSITION ADJECTIVElimited, some有限的/一定的用途general一般用途practical實際用途potential潛在用途VERB + USEFULNESShave有用途increase增加用途diminish, limit, reduce減少用途;限制用途Badly written questions limit the usefulness of questionnaires.問題設計得不好,調查問卷的作用就會打折扣。lose失去實用性Many people claim that the word has lost its usefulness.許多人聲稱這個詞已經用不上了。assess, determine, evaluate, examine評估效用;確定效用;檢驗效果question懷疑效用demonstrate, prove展示/證明效用outlive再無效用The advisory group has outlived its usefulness.顧問小組已失去了它的作用。PREPOSITIONof... usefulness⋯的作用The theory is of limited usefulness.這個理論用途有限。usefulness for⋯方面的效用the exam's usefulness for ranking students考試在為學生排名次方面的作用usefulness in在⋯方面的用途the drug's usefulness in the treatment of cancer這種藥在癌症治療中的功效usefulness to對⋯的作用The report is of potential usefulness to the government.這個報告可能對政府有用。
BNC: 8593 COCA: 9891

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