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| 地下排水管道 | |||
| 暗〔封闭式〕管道 | |||
| 封闭导管 | |||
| 封闭管道 | |||
| 暗管道 | |||
| 暗沟; 封闭式管道 | |||
| 密闭管道; 封闭式管道; 封闭管渠; 暗渠; 暗管 | |||
| closed conduit: 6 phrases in 1 subject |
| Technology | 6 |
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