英语词典
The reason is that coal seam(ⅱ) has been vigorously pressed and kneaded by the Mount Song glide tectonics and the composition and construction of the seam has been destroyed resulting in the formation of powdery coal.
因二1煤层在未开采前就遭到了嵩山巨型滑动构造的强烈挤压和揉磨,煤层结构和构造被破坏,使之成为颗粒细小的粉末状,为煤尘产生的物质条件。
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