Dams naturally alter the flow of streams, providing fish with a variety of suitable habitats.

大坝可以自然地改变河流的流动，为鱼类提供各种合适的栖息地。

They can change the flow of streams and rivers, and often cause ponds to form, creating habitats for fish, amphibians, and other creatures.

它们可以改变溪流和河流的流量，并经常导致池塘形成，为鱼类、两栖动物和其他生物创造栖息地。