mountain root

例句：

1. 1. The mountain root is an essential part of the ecosystem.
   山根是生态系统中不可或缺的一部分。
2. 2. The roots of the tree are visible through the soil.
   树的根部通过土壤可见。
3. 3. The mountain root is where the water from the river collects and flows down to the valley.
   山根是河水从河流收集并流向山谷的地方。