Aimed at the situation lack of efficient analysis tool in the study of the industrial robots executor motion, a new method, the complex index form of the 3 dimensional vectors, is put forward.
针对目前在工业机器人的执行机构运动研究中，缺少高效的分析方法的现状，本文提出了一种新方法——三维矢量的复指数形式并探讨了应用该法表示三维矢量的坐标变换形式及其导数形式。
The shape of streamlined train head is made of the 3-dimensional space free form surface, whose shape outline curve USES NURBS curve and complex shape surface USES 3-d NURBS surface.
基于流线型的列车头部外形由三维空间自由曲面构成，提出采用NURBS曲线设计外形型线和用三维nurbs曲面描述复杂三维曲面的车头外形设计方法。
However, painting and drawing also continue to inspire his working process and gives inspiration to his interpretation of form from a flat surface into a 3-dimensional one.
绘画和剪纸艺术激发着他的创作过程，演绎着从平面到立体的表现形式。
When the object underwater reflects the sound wave, we can clearly see its shape in the form of a 3-dimensional image.
当水下物体反射声波时，我们可以清楚地看到它的三维图像。
When the object underwater reflects the sound wave, we can clearly see its shape in the form of a 3-dimensional image.
当水下物体反射声波时，我们可以清楚地看到它的三维图像。
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