So, the definition will take effect. The acceleration is as a vector, and the acceleration vector is just the derivative of a velocity vector.
有必要对加速度给出一个严格的定义，加速度,作为一个矢量,是速度的一阶导数。
Since any parallax effect depends on point of view, a vector from a point on the surface to the eye is required.
因为任何视差效果都依赖于视点，所以就需要一个从表面到视点的向量。
In this paper, a new scheme of vector quantization is described to reduce the effect of error propagation.
为了降低误差积累的影响，本文提出了一种新型的矢量量化方法。
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