gully erosion form

例句：

1. 1. The gully erosion form is a common problem in mountainous areas.
   沟蚀形态是山区常见的问题。
2. 2. The gully erosion form has caused significant damage to the local ecosystem.
   沟蚀形态已经对当地生态系统造成了重大损害。
3. 3. The gully erosion form is a natural process that occurs when water flows over steep slopes.
   沟蚀形态是一种自然过程，当水流冲刷陡峭的山坡时会发生。