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催化剂 活化 : 30 phrases in 9 subjects |
| Automobiles | 3 |
| Chemistry | 3 |
| Ecology | 1 |
| Oil / petroleum | 7 |
| Oil processing plants | 1 |
| Plastics | 2 |
| Polymers | 7 |
| Space | 3 |
| Technology | 3 |
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