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反射、反射 作 用 : 14 phrases in 9 subjects |
| Air defense | 1 |
| Architecture | 1 |
| Aviation | 1 |
| Earth sciences | 1 |
| General | 3 |
| Nuclear physics | 1 |
| Space | 1 |
| Sports | 2 |
| Technology | 3 |
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