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| 11. | It became necessary to provide drainage or sewer systems to carry such wastes away from the area. |
| 提供排水系统或污水管道系统，把废物排出市区已成为必要。 |
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| 12. | brickwork and partitions, drainage and sewage, asphalt, paving, masonry, proofing, |
| 砌砖墙及隔断墙;排水管及污水管道铺设;沥青工程;路面工程;砖石工程;屋面工程; |
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| 13. | wastewater irrigation |
| 污水灌溉 |
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| 14. | The relief valve should never be solidly piped into a drainage ditch, sewer or sump. |
| 安全阀绝不能用坚硬的管道连接到排水沟、水管或污水坑里。 |
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| 15. | agricultural wastewater |
| 农业污水 |
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| 16. | secondary sewage treatment works |
| 二级污水处理厂；次级污水处理厂 |
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| 17. | combined sewage |
| 混合污水,合流污水 |
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| 18. | biology of polluted water |
| 污水生物学 |
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| 19. | domestic sewage |
| 生活污水；家庭污水 |
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| 20. | effluent filter |
| 污水过滤器 |
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