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双 调的 : 20 phrases in 10 subjects |
| Agriculture | 3 |
| Air defense | 2 |
| Economy | 2 |
| General | 4 |
| Mechanics | 1 |
| Refrigeration | 1 |
| Securities | 2 |
| Space | 1 |
| Technology | 3 |
| Telecommunications | 1 |
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