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| 泄水〔下水，落水，降液，下降，排气,〕管 | |||
| 泄水下水，下导，排气管; 下气烟道 | |||
| 下降管 | |||
| 下气 〔烟〕道 | |||
| 锅炉循环水管 | |||
| 下气道; 降气管 | |||
| 降液管; 落水管; 下导管; 下流管; 下水管 | |||
| 游泳池的下水道; 游泳池下水道 | |||
| 泄水管; 下气烟道; 排气管; 废水管; 降水管; 下降管; 高炉下气道; 排液管; 锅炉循环水管 | |||
| downcomer: 53 phrases in 10 subjects |
| Architecture | 1 |
| Chemistry | 6 |
| Company name | 1 |
| Electronics | 14 |
| General | 7 |
| Metallurgy | 7 |
| Oil / petroleum | 8 |
| Oil processing plants | 1 |
| Refrigeration | 1 |
| Technology | 7 |
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