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发生 场 : 21 phrases in 11 subjects |
| Air defense | 1 |
| China | 2 |
| Economy | 1 |
| Electric machinery | 2 |
| Electronics | 3 |
| General | 1 |
| Metallurgy | 1 |
| Nursing | 2 |
| Securities | 1 |
| Technology | 5 |
| Telecommunications | 2 |
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