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自转变 : 20 phrases in 9 subjects |
| Automobiles | 2 |
| Aviation | 3 |
| Ceramics | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 3 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 7 |
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