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| regeneration period | |||
| 再生 期: 14 phrases in 9 subjects |
| Automobiles | 3 |
| Chemistry | 1 |
| Ecology | 1 |
| Economy | 2 |
| Electronics | 1 |
| Hydrology | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
| Textile industry | 1 |
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