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双向法 : 23 phrases in 10 subjects |
| Air defense | 1 |
| Animal husbandry | 2 |
| Construction | 1 |
| Dermatology | 1 |
| Information technology | 2 |
| Management | 1 |
| Metallurgy | 5 |
| Polymers | 1 |
| Space | 1 |
| Technology | 8 |
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