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活动 顶 : 59 phrases in 9 subjects |
| Automobiles | 37 |
| Chemistry | 1 |
| Computer numerical control | 1 |
| Ecology | 1 |
| Electronics | 1 |
| Exhibitions | 1 |
| General | 4 |
| Metallurgy | 7 |
| Technology | 6 |
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