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顺 向流 : 11 phrases in 9 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 1 |
| Refrigeration | 1 |
| Technology | 3 |
| Wind Energy | 1 |
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