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| 11. | quest for improvement |
| 寻求改进 |
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| 12. | engineering improvement |
| 工程改进 |
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| 13. | improvement curve |
| 改进曲线 |
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| 14. | improvement of orbit |
| 轨道改进 |
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| 15. | improvement research |
| 改进研究 |
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| 16. | improvement of convention |
| 改进公约 |
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| 17. | convergent improvement |
| 复合改进 |
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| 18. | improvement of visibility |
| 能见度改进 |
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| 19. | work improvement |
| 工作改进 |
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| 20. | forest improvement |
| 森林改进伐 |
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