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光电发射 : 52 phrases in 10 subjects |
| Astronautics | 1 |
| Electronics | 7 |
| Food industry | 1 |
| General | 14 |
| Gold mining | 1 |
| Medical | 1 |
| Nanotechnology | 1 |
| Oil processing plants | 1 |
| Physics | 1 |
| Technology | 24 |
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