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middling coal短语解释_middling coal词组用法_middling coal短语词组_菜篮子兴趣思朗文词典
菜篮子兴趣思朗文词典

middling coal

M 开头单词

短语词组

    短语

  • middling coal bin [矿业]中煤仓
  • middling and small coal boiler 中小型燃煤锅炉
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