爱因斯坦低头，看到牛顿站在一块长、宽都是一米的正方形地板砖上，大为不解。
Einstein looked down and found that Newton was standing on a square floor board with one metre long and one metre wide. He didn't understand.
非线性方程采用位移引导或弧长引导的牛顿-拉夫森增量迭代法求解。
Newton Raphson method is used to solve the non linear equations piloted in displacements or in arc length.
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