汉译英：在生产过程中，这些工厂必须防止废水流入河流。

These factories must prevent industrial waste water flow into the river during the process of production.

我写的工业废水不要工业就把industrial 去掉

These factories have to prevent their wastewater from Polluting the rivers, during production.

over the process of production,these factories must prevent the wasted water from flowing into the river

In the process of production,these factories must prevent waste water from flowing into rivers