Vector Graphics means that the images drawn are not a collection of colored pixels.
矢量图形的意思是指所画的图像并非由一组彩色像素组成。
One thing that's on this picture that I haven't drawn down is the normal vector to the plane.
图上有个东东我没画,就是这个平面的法向量。
The extremity curve of the velocity vector at the contact point was also drawn up.
绘制了两齿面接触点处相对速度的速端曲线图。
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