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1背景现状的分析叶楠教授说过:“课堂应是向未知方向挺进的旅程,随时都有可能发现意外的通道和美丽的风景,而不是一切都必须遵循固定线路而没有激情的行
An analysis of the background status quo Prof. Ye Nan said: “The class should be a journey to the unknown direction. It is possible to find unexpected passages and beautiful scenery at any time, rather than everything that must follow a fixed line without passion.