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| double hose | |||
| two pipe system; double pipe system | |||
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双 管 式 : 69 phrases in 13 subjects |
| Architecture | 1 |
| Automobiles | 3 |
| Chemistry | 2 |
| Ecology | 3 |
| Electronics | 4 |
| Engineering geology | 3 |
| General | 1 |
| Metallurgy | 5 |
| Mining | 1 |
| Oil / petroleum | 7 |
| Refrigeration | 4 |
| Scuba diving | 1 |
| Technology | 34 |
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