自由能随半径的增大而单调地增加。
The free energy increases monotonically with increasing radius.
在液桥中间截面，自由界面半径维持不变。
The radius of the free surface is constant on the middle section of the liquid bridge.
为了研究列车中各车辆在直线上和大半径圆曲线上的蛇行稳定性，建立了具有17个自由度的车辆系统非线性数学模型。
In order to study the straight and circular curved track stability of each vehicle in the train set, a mathematical model of vehicle system with 17 freedom degrees was set up.
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