Chemical regulation means that the way to solve the problem is not direct, but to transform the problem into a problem to be solved or a problem that is easy to solve, and then go back to get the answer to the original problem.
Xiao Li and Xiao Jiang have different methods to solve the same kind of problems. Xiao Li first studies the special situation and finally solves the general problem, while Xiao Jiang first solves the general problem and then studies the special situation does not belong to reduction.