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| 21. | cylindrical spur gear |
| 圆柱正齿轮 |
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| 22. | to spur oneself on |
| 自勉 |
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| 23. | double spur grade |
| 人字坡 |
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| 24. | spur to one's imagination |
| 激发某人的想象力 |
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| 25. | elevated spur track |
| 高架分支轨道 |
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| 26. | differential (spur) drive gear |
| 差速器传动(正)齿轮 |
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| 27. | galactic radio spur |
| 银河射电支 |
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| 28. | spur a horse (on) |
| 以刺马钉策马 (前进) |
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| 29. | spur-gear blank |
| 正齿轮坯料 |
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| 30. | spur type planetary reducer |
| 正齿式行星减速齿轮 |
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