The teacher joked a joke, and everyone began to pay attention to whether he was still giggling deeply.

Teachers joke and tell jokes in class to enliven the classroom atmosphere, so that students can refresh themselves and not be bored and sleepy in class. Your teacher told this joke with good intentions, but it's not elegant for the teacher to giggle there. In your eyes, the teacher's exaggerated fake smile makes you feel uncomfortable, but it is probably a bit inappropriate for you to say that the teacher is sick. After all, I wish you better and better in your studies.