变形体的平衡 Equilibrium of a Deformable Body
平移不变的 translation invariant
怎么变得平坦的 How the World Became Flat
突变的平民 MUTATED CIVILIAN
变平或变弯曲的形状 flattened and curled shape
海平面的变化 sea levels
总物价水平的变动 general price level change
随机变数的平均数 means of random variables
保持一种平衡的变化 keep a balance of stufy
杆件变形的平截面假设 plane assumption
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