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| 61. | PI (Product Improve) |
| 产品改进 |
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| 62. | great improvement |
| 很大改进 |
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| 63. | improvement of convention |
| 改进公约 |
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| 64. | modified simplex |
| 改进单纯形 |
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| 65. | improvement patent |
| 改进专利 |
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| 66. | Improve on packing |
| 改进包装 |
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| 67. | improvement planting |
| 改进栽植 |
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| 68. | operations improvement |
| 操作改进 |
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| 69. | fuel modification |
| 燃料改进 |
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| 70. | quality improvement |
| 质量改进 |
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