screened coal 中文意思是什麼

screened coal 解釋
過篩煤
  • screened : 部分屏蔽的
  • coal : n 1 煤，煤塊，煤堆。2 〈pl 〉〈美國〉（一堆）燒紅的煤。3 〈常 pl 〉〈英國〉（幾塊）供燃燒的煤。4 ...
  1. To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it.

    據說煤中摻有石子和其它雜質須去掉時，至今仍得把煤在礦上篩過。
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