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| 墙内风道; 墙式电缆槽 | |||
| 砖风道 | |||
| 墙中空气通道 | |||
| wall duct: 10 phrases in 6 subjects |
| Anatomy | 2 |
| Electric machinery | 1 |
| Metallurgy | 1 |
| Otorhinolaryngology | 3 |
| Surgery | 2 |
| Technology | 1 |
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