useful /ˈjuːsfəl/ adjective Learner's definition of USEFUL
[more useful; most useful]
: helping to do or achieve something有用的；有益的；有帮助的 -
a useful invention/tool/skill有用的发明/工具/技能
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Does anyone have any useful suggestions/advice?谁有什么有益的建议？
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It can be useful to know CPR.了解心肺复苏术会很有用。
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The Internet is useful for finding information quickly.互联网能有助于快速查找信息。
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The therapy is useful as a treatment for diabetes. = The therapy is useful in treating diabetes.这种疗法对治疗糖尿病很有效。
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She has become one of the team's most useful players.她已经成为队里最给力的队员之一。
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Why don't you do something useful with your life?你为何不在有生之年做些有用的事呢？
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The data could prove (to be) useful [=people may eventually find that the data is helpful] in identifying future problems.这些数据对未来查找问题可能会很有用。
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I found this information (to be) quite useful.我发现这个信息很有用。
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Her pocketknife came in useful [=(more commonly) came in handy] when we needed to cut the tangled fishing line.当我们需要将打结的渔线割断时，她的小刀派上了用场。
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I tried to make myself useful [=to be helpful; to do something helpful] by organizing his closet for him.为了能让自己帮上点忙，我整理了他的衣柜。
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the useful life of a satellite [=the amount of time during which a satellite is in good enough condition to be used]卫星的运行寿命
— usefulness
noun [noncount]