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| 51. | PI (Product Improve) |
| 产品改进 |
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| 52. | great improvement |
| 很大改进 |
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| 53. | improvement of convention |
| 改进公约 |
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| 54. | corrective method |
| 改进方法 |
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| 55. | improvement patent |
| 改进专利 |
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| 56. | Improve on packing |
| 改进包装 |
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| 57. | improvement planting |
| 改进栽植 |
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| 58. | operations improvement |
| 操作改进 |
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| 59. | fuel modification |
| 燃料改进 |
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| 60. | modified simplex |
| 改进单纯形 |
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