为防止水涝，我们必须使河水改道。

To prevent flooding, we shall have to divert the river from its course.

youdao

后来因为河水改道，才逐渐衰落下来。

Later it declined due to the change of a river course.

youdao

建坝时，他们让河水改道。

They diverted the river while they is building the dam.

youdao

建坝时，他们让河水改道。

They diverted the river while they is building the dam.

youdao