river bed deposit

例句：

1. 1.The riverbed deposits are rich in minerals and nutrients.
   河床沉积物富含矿物质和养分。
2. 2. The geologists found the riverbed deposits to be a valuable resource.
   地质学家发现河床沉积物是一种宝贵的资源。
3. 3. The riverbed deposits have been used for centuries as building materials.
   河床沉积物被用作数百年来的建筑材料。