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| 51. | improvement order |
| 改良定单 |
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| 52. | grassland improvement |
| 草原改良 |
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| 53. | Ground improvement |
| 地盘改良 |
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| 54. | subsoil improvement |
| 底土改良 |
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| 55. | orderly improvement |
| 定向改良 |
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| 56. | improved drying oil |
| 改良干性油 |
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| 57. | domestic animal improvement |
| 家畜改良 |
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| 58. | improvement pedology |
| 改良土壤学 |
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| 59. | improve soil tilth |
| 改良土壤耕性 |
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| 60. | reform the government. |
| 改良政府 |
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