长江是亚洲最长的河。

The Yangtze River is the longest river in Asia.

这条河曾经非常干净。

The river used to be so clean.

一个女孩在河上滑冰。

One girl is skating on a river.

这条河被工厂污染了。

The river is polluted by factories.

今天早上，街道成了一条河。

This morning, the street's a river.