free influx

例句：

1. 1.The free influx of tourists has boosted the local economy.
   游客的自由流入已经促进了当地经济的增长。
2. 2. The free influx offresh water is essential for the survival ofthe ecosystem.
   淡水的自由流入对于生态系统的生存至关重要。
3. 3.The free influx of nutrients into thesoil is crucial for plant growth.
   营养物质的自由流入土壤对植物生长至关重要。