The professor gave a lecture to the students.

A famous botany professor and his teaching assistant are studying new varieties of plants. Suddenly, the teaching assistant asked the professor, "What should the professor do when he meets an unknown plant in the wild?"

The professor replied: "In order to avoid students asking questions, I usually walk in the front and then trample all the plants I don't know to death."

Lawyers and teachers have rules for accepting students, paying half the tuition fees first.

Win the first lawsuit and pay the other half when you finish your studies.

After the students finished their studies, they never went to court, so the teacher took the students to court to recover their tuition fees.

The teacher said, "If I win, you have to pay my tuition; if you win, you have to pay my tuition",

The student said, "If I lose, I won't have to pay the tuition. If I win, I don't have to pay tuition. " .