这是发生在皮肤的真皮层，由于胶原蛋白和弹力纤维越来越硬，厚而然后结合在一起。
This occurs in the skin's dermis, as a result of collagen and elastin fibers becoming hard, thick, and then binding together.
硬斑病是一种结缔组织病，其特征是皮肤因胶原沉积过多而硬化和增厚。
Morphoea is a connective tissue disorder characterised by hardening and thickening of the skin due to an increased collagen deposition.
问题：厚硬，干燥和粗糙的皮肤。
张双楼煤矿主采煤层为7煤和9煤，两层煤之间赋存唯一一层厚硬岩层，即9煤层的直接顶也是7煤层的直接底。
The hard-and-thick strata ACTS both as the floor of coal seam No. 7 and as the roof of coal seam No. 9 in Zhangshuanglou coal Mine; and coal seam No. 9 is also hard.
张双楼煤矿主采煤层为7煤和9煤，两层煤之间赋存唯一一层厚硬岩层，即9煤层的直接顶也是7煤层的直接底。
The hard-and-thick strata ACTS both as the floor of coal seam No. 7 and as the roof of coal seam No. 9 in Zhangshuanglou coal Mine; and coal seam No. 9 is also hard.
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