根据牛顿运动第三定律，作用力和反作用力是大小相等方向相反的。
According to Newton's Third Law of Motion action and reaction are equal and opposite.
颗粒的运动满足牛顿第二定律，流体相的运动规律由局部平均的纳维斯托克斯方程求解，两相间的耦合由牛顿第三定律决定。
The motion of individual particles is obtained by solving Newtons second law of motion and gas flow by the Navier Stokes equation based on the concept of local average.
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