... grade 等级 graded coal 筛过煤 graded aggregate 分级粒料,级配骨料...
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过筛煤 graded coal
筛过的煤 screened coal
采煤场筛选过的煤 colliery screened
筛过煤
Screened coal
以上为机器翻译结果，长、整句建议使用 人工翻译 。
据说煤中掺有石子和其它杂质须去掉时，至今仍得把煤在矿上筛过。
To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it.
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