| 1. | Secondary principal plane 第二主平面 |
| 2. | Principal plane of symmetry 主对称面 |
| 3. | Principal plane of inertia 诌性平面 |
| 4. | Primary principal plane 第一主平面 |
| 5. | Principal plane of stress 枝力平面 |
| 6. | Principal plane of glide 脂移平面 |
| 7. | Locating the orientation of the corresponding relationship between principal stress and principal plane and its mathematics certification 主应力与主平面对应关系的判定及其数学证明 |