第二个是自由软件定义的四个自由度。
预报采用进退、横漂、首摇和横摇四个自由度的方程，考虑了横摇对水平面运动的耦合影响。
The mathematic model has four degrees of freedom (surge, sway. yaw and roll), taking the couple motion of roll on horizontal plane motion into account.
或者让每四个周末中有一个自由周末，在这个周末你就是休息、自娱自乐。
Or try making one weekend in four a “free” weekend when you can just rest and enjoy yourself.
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