I remember it was a math class a week ago. I dropped my pen and bent down to pick it up. I never understood math again...

Such a sentence may have different meanings when placed in a specific paragraph, but it is not difficult to understand just the original meaning.

What it may mean is that mathematics is a very logical subject. Once a point is broken, you will not understand the subsequent content, because the concepts, algorithms and derivation of the subsequent content are often unclear. Reference previous knowledge.

For students with a relatively weak foundation in mathematics, it is possible for students who seem to understand but don’t understand the subject to fail once they fail. If you have a solid foundation and a strong foundation, this situation will not happen. If you fall behind, you can make up for it after class.