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| 双层罩 | |||
| 双层外壳 | |||
| 双层机壳式 | |||
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double casing : 22 phrases in 9 subjects |
| Chemistry | 1 |
| Construction | 1 |
| Drilling | 2 |
| Electric machinery | 2 |
| Hydroelectric power stations | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 4 |
| Shipbuilding | 2 |
| Technology | 6 |
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