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聚焦管 : 27 phrases in 13 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Construction | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 4 |
| Geophysics | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Radio | 1 |
| Space | 3 |
| Technology | 6 |
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