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光声谱 : 44 phrases in 12 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Chemistry | 5 |
| Earth sciences | 5 |
| Electronics | 9 |
| General | 2 |
| Geology | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Plastics | 2 |
| Space | 8 |
| Technology | 7 |
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