Rivers and lakes have dried up, and fish are trapped on the ground. They lovingly moistened each other with saliva, showing kindness and loyalty. This is not as good as when Jiang Hushui was full. Everyone freestyle and didn't take care of each other.

Zhuangzi said this sentence means that human kindness is limited after all. When people need kindness to help each other, the world is already bad, and the love for nature is endless, so people should forget nature, just like fish forget rivers and lakes.