And, the way we can get it, so, it's called usually V, so, V here stands for velocity more than for vector. And, you just get it by taking the derivative of a position vector with respect to time.
根据它的原理，我们通常用v表示,这里的V更代表速率而不是矢量，你能通过,对一个关于时间的位置向量求导得到它。
dt If you divide both sides by dt, which mathematicians cannot do, but physicists can, then you get /dt=ds/dt d theta/dt equals ds/dt, and v/l that is the velocity divided by l.
如果两边同除以，数学家不会这么做，但是物理学家可以,得到dθ,等于。
You can get even more details about your users by passing the -v flag, which is shown in Listing 7.
通过传递- v标记，您可以获得有关用户的更多详细资料，如清单7所示。
The work spindle get four-grade rotate speed, which is driven by a couple of two-grade v-belt pulley.
由一对两级三角皮带轮传动工件主轴，使其获得四级转速；
The work spindle get four-grade rotate speed, which is driven by a couple of two-grade v-belt pulley.
由一对两级三角皮带轮传动工件主轴，使其获得四级转速；
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