heavy cover

• 厚层覆盖岩层

heavy cover的用法和样例：

例句

1. A thick, heavy covering for a floor, usually made of woven wool or synthetic fibers; a rug.
   地毯地板上的厚重的覆盖物，通常用织成的羊毛或合成纤维做成; 皮毛地毯