soil expansion

例句：

1. 1. Soil expansion is a natural process that occurs when soil moisture levels rise.
   土壤膨胀是一种自然过程，当土壤湿度上升时会发生。
2. 2. The expansion of the soil has led to the formation of new landforms.
   土壤的扩张导致了新的地形的形成。
3. 3. To prevent soil expansion, it's important to maintain proper irrigation and drainage systems.
   为了防止土壤膨胀，重要的是保持适当的灌溉和排水系统。