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Noun:
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the quality of being of practical use
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用作名詞 (n.)
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It is of the greatest usefulness.
它是極也有用的。
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This tool has even more usefulness than that.
這家軟件工具比哪一個更有所幫助。
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The duality of use value refers to its usefulness and rarity.
在使用意義的兩重性指的是好使性和極少性。
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左右知識獨門原創,受作品權保護的,侵權行為必究
海詞漢語詞典,十八年牌子