2. Original intention: Zhuangzi and Keiko are playing on Haoshui Bridge.
3. Zhuangzi said: "It is the pleasure of fish to swim leisurely in the river.
4. "Keiko said," You are not a fish. How do you know that fish is happy? "Zhuangzi said," If you are not me, how do you know that I don't know the happiness of fish? Keiko said, "I'm not you, so I don't know you;" "You are not a fish, you know nothing about fish.
5. "Zhuangzi added," Please start from the original topic.
6. You said,' How do you know the happiness of fish?' You ask this, which means that you have admitted that I know the happiness of fish, so you will ask me how I know it.
7. I am on the shore of good water and know that fish are happy.