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活 动叶 : 43 phrases in 9 subjects |
| Agriculture | 3 |
| Architecture | 1 |
| Automobiles | 2 |
| Electric machinery | 4 |
| Hydroelectric power stations | 3 |
| Plastics | 2 |
| Refrigeration | 4 |
| Rowing | 2 |
| Technology | 22 |
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