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| 特殊材料; 专门器材 | |||
| 专用材料; 特殊种材料 | |||
| 专用器材 | |||
| 特种材料 | |||
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special material : 19 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Economy | 1 |
| Electronics | 3 |
| General | 1 |
| Librarianship | 1 |
| Space | 3 |
| Technology | 7 |
| Textile industry | 1 |
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