Make a pun.

1. Teacher Zhang always likes to make puns.

Maybe the author made a pun, alluding to the "track" of the train.

3. Ambiguity usually comes from language, semantics and syntax, and the unique function of pun is often used flexibly to achieve satire and humor.

4, wonderful! What a pun! You can choose your own room except my room, little brother.

5. Advertising language is a pun on the product name.

6. Shakespeare, a great literary master, was written a pun "yellow joke" in Romeo and Juliet, which was criticized by the playwright.

7. In a paper, he called this kind of intelligence without center "irrational energy", which is interesting but subtle, pun intended.

This ancient theorem is a pun here. It's not a laugh to say that the Chinese restaurant takes the leftovers to the next table.