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| spectral content | |||
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光谱 成分 : 18 phrases in 8 subjects |
| Artificial intelligence | 1 |
| Aviation | 2 |
| Earth sciences | 3 |
| Ecology | 1 |
| Electronics | 1 |
| Geology | 1 |
| Space | 6 |
| Technology | 3 |
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