v
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to help ; to be of use ; to serve
돕다 ; 유익하다 ; 봉사하다
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My preparation did not _____ me on the test ; the examination covered a chapter other than the one that I studied. (I could also say that my preparation _____ed me nothing, or that it was of no _____. In the second example, I would be using _____ as a noun.)
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_____ing 은 도움이 되거나 쓸모가 있다는 뜻이며, un_____ing 은 유익하지 못하고 쓸모가 없다는 뜻이다.
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The rescue workers tried to revive the drowning victim, but their effort were un_____ing, and the doctor pronounced him death.