片语
inclined coal seam倾斜煤层
steeply inclined coal seam急倾斜煤层
deeply inclined coal seam急倾斜煤层
inclined thin seam倾斜薄煤层
sharp inclined coal seam急倾斜煤层
steep inclined thin seam急倾斜薄煤层
big inclined coal seam大倾角煤层
deep inclined thick seam急倾斜特厚煤层
inclined thick seam急倾斜厚煤层