积少成多，滴水成流。
作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
资源库可以分支成多条流，这些流用名称加以区别。
A repository can branch into multiple streams, which are distinguished by name.
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