定点转动 meaning in English

rotation around a fixed point

The description of fixed - point rotation needs two three - dimensional coordinates , three independent variables . the relations of this coordinates and variables are so complexity that it ' s difficult to show the movement of fixed - point rotation . instructing the fixed - point rotation becomes a problem . using 3d animated graphics assist teaching ; we have solved this problem well
定点转动需要两个三维坐标系、三个独立变量来描述其运动.由于它空间性强、矢量关系复杂,运动图像不易展示,成为教学中的难点.我们利用三维动画辅助讲解,较好地解决了这一问题
And the basic conceptions and studying measures of nonlinear mechanics should be introduced into the theoretical mechanics " course and teaching . 2 、 modernization of measures of theoretical mechanics teaching should be focused , and techniques of computer should be introduced into the theoretical mechanics " course and teaching . using matlab software as a study tool , students
最后，本文选取了两个典型实例：以单摆的运动作为“接口” ，在理论力学教学中逐步引入非线性力学的一些基本概念和基本内容；以刚体的定点转动为例介绍利用计算机的数值计算和模拟技术来研究理论力学中的非线性问题。