研究者称孕妇不跌倒的原因和进化曲线有着密切的联系。

Pregnant women do not tip over, and researchers say an evolutionary curve has a lot to do with the reason why.

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因此，很多非线性演化方程都与曲线和曲面运动有着密切的关系。

So many nonlinear evolution equations have been shown to be closely related to motions of curves and surfaces.

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许多有意思的非线性演化方程都与曲线运动有着密切的关系。

Many interesting nonlinear evolution equations have been shown to be related to motions of curves.

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