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防着 : 24 phrases in 10 subjects |
| Aviation | 1 |
| Chemistry | 2 |
| Finances | 1 |
| General | 2 |
| Metallurgy | 1 |
| Plastics | 1 |
| Space | 1 |
| Technology | 10 |
| Textile industry | 3 |
| Water resources | 2 |
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