etch pit

例句：

1. 1. The car's engine has a deep etched pit in the center.
   这辆车的引擎中心有一个深深的蚀坑。
2. 2. The rock is covered with deep etched pits that were formed by the water.
   这块岩石上布满了由水形成的深蚀坑。
3. 3. The pit was filled with water after the earthquake.
   地震后，这个坑被水填满了。