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电离场 : 28 phrases in 10 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Chemistry | 3 |
| Earth sciences | 2 |
| Electronics | 10 |
| General | 1 |
| Geology | 1 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 7 |
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