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| 11. | imperfect drainage |
| 不完善排水 |
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| 12. | drainage outlet |
| 排水出口 |
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| 13. | vertical drainage |
| 垂直排水 |
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| 14. | drainage engineer |
| 排水工程师 |
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| 15. | artificial drainage |
| 人工排水 |
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| 16. | marshland drainage |
| 沼泽地排水 |
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| 17. | land drainage |
| 地面排水 |
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| 18. | Drainage Coefficient |
| 排水系数 |
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| 19. | pipe drainage |
| 暗管排水 |
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| 20. | drainage equipment |
| 排水施设 |
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