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示迹 器 : 45 phrases in 12 subjects |
| Air defense | 2 |
| Automobiles | 1 |
| Aviation | 6 |
| Earth sciences | 1 |
| Electronics | 4 |
| General | 2 |
| Metallurgy | 1 |
| Nautical | 1 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 2 |
| Space | 9 |
| Technology | 15 |
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