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波纹管式 : 31 phrases in 9 subjects |
| Automobiles | 6 |
| Chemistry | 2 |
| Compressors | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 4 |
| Oil / petroleum | 2 |
| Space | 2 |
| Technology | 12 |
| Textile industry | 1 |
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