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| 21. | fire service ring main |
| 消防环形总水管 |
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| 22. | consumer main cut-out |
| 用户总熔断器 |
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| 23. | water main laying |
| 总水管敷设工程 |
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| 24. | connection to the main |
| 总水管接驳装配 |
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| 25. | ring main system |
| 环形总水管系统 |
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| 26. | main electric power supply fuse |
| 总电源保险丝 |
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| 27. | main equipotential bonding |
| 总等电位接驳 |
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| 28. | water main diversion works |
| 总水管改道工程 |
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| 29. | main repeater office |
| 总增音站 |
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| 30. | main-process stream |
| (工艺)主流程线;总流程 |
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