... colliery guaranter 煤矿保证条款 colliery screened 采煤场筛选过的煤 colliery screened 采煤场筛选过的煤精选的煤 ...
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colliery screened 采煤场筛选过的煤精选的煤; 精选的煤..
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To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it.
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。
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