root of weld

例句：

1. 1.The root of the problem lies in the weak foundation of the company's operations.
   问题的根源在于公司运营的薄弱基础。
2. 2. The roots of the forest are deep and spread out widely.
   森林的根深且分布广泛。
3. 3. The root of the disease is often found in the soil or water.
   这种疾病的根源通常存在于土壤或水中。