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qunlun
- 讲解群论的书记，由中科大的朱界杰老师讲解，很详细，很易懂，希望有需要的童靴自行拿去-Secretary of group theory to explain, by the USTC sector Jie Zhu teacher to explain, very detailed, very easy to understand, I hope there is a need to take their own children' s boots