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双射线 : 61 phrases in 13 subjects |
| Agriculture | 1 |
| Air defense | 3 |
| Automobiles | 1 |
| Aviation | 1 |
| Cryptography | 2 |
| Drilling | 1 |
| Electronics | 23 |
| General | 1 |
| Metallurgy | 6 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Space | 8 |
| Technology | 12 |
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