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51. | improve soil tilth |
| 改良土壤耕性 |
|
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52. | die modifications |
| 模具改良 |
|
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53. | improvement seeds |
| 改良种子 |
|
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54. | improvement order |
| 改良定单 |
|
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55. | grassland improvement |
| 草原改良 |
|
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56. | domestic animal improvement |
| 家畜改良 |
|
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57. | Ground improvement |
| 地盘改良 |
|
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58. | improved drying oil |
| 改良干性油 |
|
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59. | orderly improvement |
| 定向改良 |
|
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60. | improvement pedology |
| 改良土壤学 |
|
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