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坚性 : 131 phrases in 10 subjects |
| Chemistry | 1 |
| Construction | 3 |
| Education | 17 |
| Electronics | 1 |
| General | 83 |
| Geology | 1 |
| Oil processing plants | 6 |
| Photography | 1 |
| Psychology | 1 |
| Technology | 17 |
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