rockover draw moulding machine

例句：

1. 1. The geologist found the rockoverlayer to be a significant indicator of theformation of the mountain range.
   地质学家发现岩石覆盖层是形成山脉的重要指示。
2. 2. Theconstruction crew had to remove the rockoverlayer before they could start building on topof it.
   施工队伍在开始在上面建造之前，必须先移除岩石覆盖层。
3. 3. The rockover layer is an important source of mineralsfor the local economy.
   岩石覆盖层是当地经济的重要矿物来源。