... coarse-grained ==> 粗粒状的,纹理粗疏的 coarse-grained coal ==> 粗纹理煤 coarse-grained fracture ==> 粗晶断口 ...
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coarse grained coal 粗纹理煤
coarse-grained coal
粗粒度的煤
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In the part of west flank of Lujiatuo minefield, the normal siltstone roof of coal seam 8 changed into coarse to medium-grained sandstone, and also had phenomenon of coal seam pinch-out.
吕家坨井田西翼部分区域八煤层顶板由正常的粉砂岩变为粗中砂岩，并有煤层变薄现象。
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