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| 11. | centre-line of track |
| 轨道轴线 |
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| 12. | crossing point of axes |
| 轴线交点 |
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| 13. | axis of a cylinder |
| 圆柱体轴线 |
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| 14. | axis of workpiece |
| 工件轴线 |
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| 15. | shaft axis of rotor |
| 转子轴线 |
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| 16. | centreline of boiler |
| 锅炉轴线 |
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| 17. | blade-span axis |
| 桨叶轴线 |
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| 18. | axis of an airfoi |
| 机翼轴线 |
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| 19. | crystal axial line |
| 晶轴线 |
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| 20. | dynamic axis of flow |
| 河流动力轴线 |
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