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| 材料保护 | |||
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material protection : 16 phrases in 9 subjects |
| Aviation | 1 |
| China | 1 |
| Ecology | 2 |
| Metallurgy | 1 |
| Nautical | 1 |
| Rail transport | 1 |
| Space | 4 |
| Technology | 4 |
| United Nations | 1 |
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