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| 21. | Pareto improvement |
| 帕累托改进 |
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| 22. | unit improvement factor |
| 装置改进因数 |
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| 23. | protein improvement |
| 蛋白质的改进 |
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| 24. | system improvement time |
| 系统改进时间 |
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| 25. | improvement costs |
| 固定资产改进费用 |
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| 26. | method improvement |
| 方法的改进 |
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| 27. | improvement felling |
| 改进伐;抚育伐 |
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| 28. | modulation noise improvement |
| 调制噪声改进 |
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| 29. | improvement cutting |
| 改进伐，抚育伐 |
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| 30. | patent of improvement |
| 改进的专利 |
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