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cloudyhsieh711
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penrose阶梯11
未命名
幾何作圖動畫示範的副本
高尔顿钉板
Penrose 三角形
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http://www.qsir.org/?p=8853
分段移動
Test1
圆台体积
三圓外切2
Discover Topics
Statistics
Addition
Piecewise Functions
Function Graph
Differential Calculus
