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保护材料 : 16 phrases in 9 subjects |
| Automobiles | 1 |
| China | 1 |
| Dentistry | 1 |
| General | 2 |
| Metallurgy | 2 |
| Nautical | 2 |
| Space | 1 |
| Technology | 5 |
| United Nations | 1 |
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