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| 31. | environmental impro vement |
| 环境改进 |
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| 32. | Other Suggestion |
| 改进意见 |
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| 33. | stability improvement |
| 稳定性改进 |
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| 34. | improvement curve |
| 改进曲线 |
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| 35. | reliability improvement |
| 可靠性改进 |
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| 36. | erational development |
| 运行改进 |
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| 37. | Try and improve. |
| 尽量改进. |
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| 38. | locality inprovement |
| 局部改进 |
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| 39. | engineering improvement |
| 工程改进 |
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| 40. | improvement research |
| 改进研究 |
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