英语词汇first triad是什么意思，first triad的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-觉斋网

单词	first triad
释义	first triad　【化】铁三素组(指铁钴镍); 铁类金属; 铁基金属; 黑色金属
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