When it comes to review, it is estimated that there are not many teachers who can compare with Cheng Keshu. After all, teachers can only think about problems from the perspective of teachers, but Cheng Keshu is different. She is a student originally, and she has summarized a set of principles in high school. Of course, I cannot copy all my own learning methods to Xie Ningtian, but I can learn from them....
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