它用四种类型的图层来创建动画：矢量、图形、位图以及声音和照相机。
When creating animations it USES four types of layers: vector graphics, bitmap, sound and camera.
介绍了四种异步电机矢量控制方法，分析了各种方法的优缺点，指出各种方法的适用场合。
The four vector control methods of induction machines are introduced . Their merits and drawbacks are analyzed . And it indicates that they are applied in different occasion.
文中根据曲线曲面型值点，分别用四种参数化方法构造节点矢量，利用NURBS方法反算控制点。
In this paper, the control points are calculated based on the curve or surface's data points and the knot vector which is calculated with four kinds of parameterization by the method of NURBS.
文中根据曲线曲面型值点，分别用四种参数化方法构造节点矢量，利用NURBS方法反算控制点。
In this paper, the control points are calculated based on the curve or surface's data points and the knot vector which is calculated with four kinds of parameterization by the method of NURBS.
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