medium grained sand 中粒沙 ; 中粒砂
medium grained 中等粒度的 ; 中级粒度的
medium-grained grinding stone 中粗磨石
medium grained asphalt concrete 中粒级配地沥青混凝土
medium-grained structure 中等粒状结构
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。
Pores are closely correlated with sandstone fabric, and are more easily generated in medium grained sandstone where feldspar content is high(>37%) and cement content is low(carbonate<50%).
孔隙与砂岩组构密切相关，孔隙更容易产生于长石含量高（>37% ）、且胶结物含量低（碳酸盐<5 % ）的中粒砂岩中。
The ore-hosting Yaojia Formation is composed of a set of braided stream medium-fine grained sediments.
姚家组为一套中细粒辫状河流沉积。
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