A classmate always asks me what I don't understand, and then laughs at my ignorance. How can I refute him?

1. First of all, look at his intention: if it is a friendly discussion, you can discuss it with him; If you are up to no good and want to see your joke, you can ignore it, even if you know the answer to the question, you don't have to discuss it with him.

2. Pay more attention to study, broaden your horizons and accumulate knowledge.

Hold a sincere attitude towards others, no matter what others think of you, you stick to your own rules of life. Knowing is knowing, and not knowing is not knowing.