A symmetrical body rotating about an axis, one point of which is fixed, is called a top. 形状对称的一物体绕其轴转动,若轴上一点固定不动,则这个物体就叫做陀螺。
FIGURE 7. Typical symmetrical distribution of seborrheic dermatitis on the head ( top), and on the body ( bottom). 图-7(头)皮屑和瘙痒-脂溢性皮炎在人体的头部、身体多发部位。
The movement of symmetrical top is used as an example to discuss the advantage and problems of attitude simulation with quaternion method. 以对称重陀螺为例,探讨了四元数在刚体姿态仿真中的应用及应用中存在的问题。