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| 41. | climatic amelioratio |
| 气候改良 |
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| 42. | improved channels |
| 改良航道 |
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| 43. | improved latrine |
| 改良厕所 |
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| 44. | die modifications |
| 模具改良 |
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| 45. | polish up; shine;improve on |
| 擦亮;改良 |
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| 46. | seed amelioration |
| 种子改良 |
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| 47. | ameliorative measure |
| 改良措施 |
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| 48. | creative maintenance |
| 改良保全 |
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| 49. | agricultural improvement |
| 农业改良 |
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| 50. | improvement seeds |
| 改良种子 |
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