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| 31. | external drainage |
| 外流水系；明沟排水 |
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| 32. | methane drainage |
| 排放瓦斯 |
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| 33. | through drainage |
| 贯穿水系 |
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| 34. | reticulate drainage |
| 网状水系 |
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| 35. | pumping drainage |
| 抽排 |
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| 36. | internal drainage |
| 内排水 |
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| 37. | postural drainage |
| 体位引流 |
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| 38. | autogenetic drainage |
| 自成水系 |
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| 39. | preglacial drainage |
| 冰期前水系 |
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| 40. | offset drainage |
| 不均衡开采 |
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