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| 11. | absolute instantaneous centre of velocity |
| 绝对速度瞬心 |
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| 12. | instantaneous centre of velocity |
| 速度瞬心 |
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| 13. | centre of a conic |
| 二次曲线的心 |
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| 14. | position of cushion pressure centre |
| 气垫压心位置 |
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| 15. | centre of mass system |
| 惯心系统 |
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| 16. | relative instantaneous centre of velocity |
| 相对速度瞬心 |
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| 17. | centre of a quadric |
| 二次曲面的心 |
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| 18. | tailstock centre |
| 尾|架顶尖|尾座顶心 |
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| 19. | instantaneous centre of acceleration |
| 加速度瞬心 |
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| 20. | the centre of buoyance |
| 【物】浮力中心, 浮心 |
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