LZ means let's explain the requirements of this paper.

Mathematical modeling is to abstract practical problems encountered in reality into mathematical models, and use the models to get the answers we need.

First of all, you need to find a real problem to be solved, but this problem is not a direct mathematical problem, and you need to abstract its mathematical model. This model may involve many classic formulas that you have learned, and they are built together in a complicated way. Finally, a scheme that meets our needs is obtained through calculation. This method can not only solve practical problems, but also be applicable to a certain class. That's probably what it means.

That is, ask yourself and answer yourself, but the questions you ask must be meaningful.