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| 21. | environmental impro vement |
| 环境改进 |
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| 22. | Other Suggestion |
| 改进意见 |
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| 23. | stability improvement |
| 稳定性改进 |
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| 24. | improvement curve |
| 改进曲线 |
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| 25. | reliability improvement |
| 可靠性改进 |
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| 26. | erational development |
| 运行改进 |
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| 27. | Try and improve. |
| 尽量改进. |
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| 28. | locality inprovement |
| 局部改进 |
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| 29. | engineering improvement |
| 工程改进 |
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| 30. | improvement research |
| 改进研究 |
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