pit fault

例句：

1. 1. The rock formation is a natural pit fault that has been formed over millions of years.
   这个岩石构造是一个自然形成的坑洞，已经形成数百万年了。
2. 2.The old house had several pit faults in the foundation that needed repair.
   这所老房子的地基有几个需要修理的坑洞。
3. 3. The engineer carefully inspected the pit fault to ensure it was stable before proceeding with the excavation.
   工程师仔细检查了坑洞以确保它稳定后才开始挖掘。