water and sand variability

• 水沙变化

water and sand variability的用法和样例：

例句

1. Meantime, the discharge distribution of water and sediment and human activities have palyed important roles in the evolutions.
   泥沙淤积是水沙变化的主要因素，江湖流量的分配在水沙变化中起著重要作用，人类活动也扮演著重要的角色。