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| double-pipe system | |||
| dual system; twin-pipe system; two-pipe system | |||
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| double main system | |||
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双 管系统 : 66 phrases in 12 subjects |
| Architecture | 3 |
| Automobiles | 5 |
| Earth sciences | 1 |
| Ecology | 3 |
| Hydraulics | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Mining | 1 |
| Nautical | 1 |
| Rail transport | 1 |
| Refrigeration | 8 |
| Technology | 39 |
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