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代詞 precursor:
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a substance from which another substance is formed (especially by a metabolic reaction)
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a person who goes before or announces the coming of another
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something that precedes and indicates the approach of something or someone
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以內知識強勢來襲寫作，受學術出版權保障，侵權行為必究
海詞詞典翻譯，十八年知名品牌
美
[pri?'k??s?z]