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71. | batter drainage |
| 斜向排水沟 |
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72. | indoor drainage |
| 室内排水 |
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73. | juvenile drainage |
| 初生水系 |
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74. | contour drainage |
| 围线排水 |
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75. | central drainage |
| 集中排水 |
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76. | raidal drainage |
| 径向排液 |
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77. | impeded drainage |
| 不良排水 |
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78. | blocking drainage |
| 阻塞水系 |
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79. | beaded drainage |
| 连珠小河 |
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80. | annular drainage |
| 环形排水系统 |
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