And, we look at how the position vector changes.
来看看位置矢量的改变。
So, it's the second derivative of a position vector.
它是位置向量的二阶导。
Well, I claim that the position vector is in the plane.
我断言，这个位置矢量在平面上。
So, we want to decompose the position vector into a sum of simpler vectors.
故我们是把位置向量，分解为简单向量的和。
So, the velocity vector is the derivative of a position vector with respect to time.
速度向量，是位置向量关于时间的导数。
And I can rewrite this in vector form as the gradient dot product the amount by which the position vector has changed.
可以把这些用向量形式重新写下来，就是梯度向量和位置改变量的点积。
Objective to investigate the application of position vector in balance evaluation of stroke patients with hemiplegia.
目的探讨位置矢量分析在偏瘫患者平衡功能评定中的应用。
The latter estimates the vehicle position by synchronizing the speed vector and the position vector measured by Beidou system.
后者首先同步车速矢量与北斗卫星测量得到的车辆位置矢量，再根据融合结果估算车辆定位信息。
So, if you just look at the position vector, and the velocity vector for any motion at any given time, then together, they determine some plane.
如果你看一下任何时刻运动时的，位置矢量和速度矢量，它们决定了某个平面。
So, if you just look at the position vector, and the velocity vector for any motion at any given time, then together, they determine some plane.
如果你看一下任何时刻运动时的，位置矢量和速度矢量，它们决定了某个平面。
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