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| activation center | |||
| activation centre; active nucleus | |||
| activator center | |||
| activated center; active center | |||
| 活化 中心: 10 phrases in 5 subjects |
| Desert science | 1 |
| Oil / petroleum | 1 |
| Polymers | 3 |
| Technology | 2 |
| United Nations | 3 |
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