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OK, so that's the velocity vector.
好,这就是速度矢量。
And so, that's called the velocity vector.
因此我们叫它速度矢量。
OK, that's what we call the velocity vector.
就是我们所说的速度矢量。
It comes from the fact that velocity is a vector and you can change your velocity vector by changing your direction.
其原理就是,速度是矢量,你可以通过改变方向来改变速度
Just take the derivatives and that's the velocity vector.
直接计算对时间的导数就是速度矢量
you get the velocity vector.
就可以得到速度矢量
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