Therefore, it is necessary to accurately know the position of coal layer and its parameters.
因此，准确地掌握煤层位置和有关参数是十分必要的。
A thin layer or stratum, as of coal or rock.
薄薄的一层或层面，如煤或岩石的。
There's a thin layer of coal between the two layers of rock.
在这两层岩石之间有一薄层煤。
There's a thin layer of coal between the two layers of rock.
在这两层岩石之间有一薄层煤。
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