euler angle的用法和样例：
例句
- This is due to the fact that Euler angles are always expressed relative to the global coordinate system.
这归咎于欧拉角总是以球坐标系表示。 - The differential equations of equilibrium of the constrained rod are established taking Euler angles as variables to describe the attitude of the cross section.
以描述截面姿态的欧拉角为变量，建立受约束弹性杆的平衡方程。
