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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...

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