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微积分入门，从数学的角度理解世界，圆球，圆锥、圆柱是如何切割
适合中小学生，启蒙理解什么是微积分，顺便普及了一下化学和生物知识，关于弦理论，这个还只是一个理论，有望成为本世界最牛掰的物理学论述
几何学，适合初中生、高中生、大学生20/52
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