ground water in alluvial plain

例句：

1. 1.The river flows through the alluvial plain.
   河流流经冲积平原。
2. 2.The alluvial soil is fertile and suitable for agriculture.
   冲积土壤肥沃，适合农业。
3. 3. The alluvial deposits are rich in minerals.
   冲积沉积物富含矿物质。