Pupils make sentences and jokes and multiply formulas

A joke by Uncle Wang eased the tension here.

Second, in class, the teacher told a joke to sweep away the boring atmosphere in the classroom.

Thirdly, the jokes told by the teacher are really funny, and the students are all convulsed with laughter.

After school, students always like to listen to his jokes for fun.

He told her a joke vividly.

He told a joke on purpose to dilute the tension.

This is just a joke. How can you take it seriously?