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21. | operations improvement |
| 操作改进 |
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22. | improvement of convention |
| 改进公约 |
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23. | improvement patent |
| 改进专利 |
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24. | modified simplex |
| 改进单纯形 |
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25. | improvement planting |
| 改进栽植 |
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26. | PI (Product Improve) |
| 产品改进 |
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27. | fuel modification |
| 燃料改进 |
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28. | corrective method |
| 改进方法 |
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29. | Improve on packing |
| 改进包装 |
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30. | quality improvement |
| 质量改进 |
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