Complex roof strata

• 复杂顶板

Complex roof strata的用法和样例：

例句

1. The shingles of the roof lapped over neatly.
   屋顶板重叠得很整齐。
2. Scaling can be safely carried out from inside the cage through the roof.
   可以在罐笼里边通过其顶板安全地进行找项工作。