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