roof separation layer

• 顶板离层

roof separation layer的用法和样例：

例句

1. The roof separation is the great safe peril in bolter support roadways.
   顶板离层是锚杆支护巷道最大的安全隐患之一。
2. The data of roof separation is considered to be a comprehensive index that can forecast the stability of roadways.
   顶板离层值是一个能预测巷道稳定性的综合指标。