This sudden change in the direction of the friction force made the system extremely non-linear and the solution process highly complicated.
摩擦力方向的这种突然改变使系统变得高度的非线性，求解十分复杂。
This sudden change in the direction of the friction force made the system extremely non-linear and the solution process highly complicated.
摩擦力方向的这种突然改变使系统变得高度的非线性，求解十分复杂。
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