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| loop-change-loop | |||
| 环变 式: 22 phrases in 10 subjects |
| Aviation | 1 |
| Cryptography | 1 |
| Electric machinery | 3 |
| Information technology | 5 |
| Metallurgy | 1 |
| Rail transport | 1 |
| Technology | 7 |
| Telecommunications | 1 |
| Textile industry | 1 |
| United Nations | 1 |
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