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气 流下降 : 19 phrases in 10 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| General | 3 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Skydiving | 2 |
| Technology | 4 |
| Wind Energy | 3 |
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