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号信箱 : 36 phrases in 10 subjects |
| Aviation | 3 |
| Business | 1 |
| Electronics | 16 |
| Mechanic engineering | 1 |
| Metallurgy | 4 |
| Nautical | 2 |
| Rail transport | 1 |
| Space | 2 |
| Technology | 5 |
| Transport | 1 |
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