旋转轴; 转动轴; 自转轴
1. 旋转轴：旋转圆柱状褶皱 rotational cylinderoidal fold | 旋转轴 axis of rotation | 旋转轴 rotation axis
2. 转轴：axis 轴 | axis of rotation 转轴 | back e.m.f. 反电动势
3. 摆轴;旋转轴：axial vibration,轴向振动 | axis of rotation,摆轴;旋转轴 | axix of strain gauge,应变计[片]轴线
4. 转动轴：torque 转矩 | axis of rotation 转动轴 | moment of inertia 转动惯量