any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent 電子が原子やイオンに加えられるとき（例えば酸素を取り除き水素を加える事によって）の過程。常に還元剤の酸化に付随して起こる。
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【上位】 (chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water" 1つ以上の物質が他の物に変わるという過程。
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