vetical cross section of coal seam

例句：

1. 1. The coalseam is 2 metersthick.
   煤层厚度为2米。
2. 2.The miners need to know the thicknessof the coal seam to avoid accidents.
   矿工需要知道煤层的厚度以避免事故。
3. 3.The thickness of the coal seam affectsthe mining process.
   煤层的厚度影响采矿过程。