1. It successfully crosses over these type of terrain. 2. But, when it encounters a very extreme terrain, 3. It's trying to walk over a changing terrain, 4. A soft terrain where it pushes down and changes. 5. It's trying to walk on the coarse terrain, 6. The terrain of this region is prone to change. 7. Walking over unstructured terrain. 8. And yet the terrain was very familiar. 9. You look for somebody who knows the terrain. 10. So, it depends on the terrain.
