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| national evolution | |||
| natural selection | |||
| 天 演: 18 phrases in 8 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Animal husbandry | 1 |
| Desert science | 1 |
| Ecology | 1 |
| General | 3 |
| Space | 3 |
| Technology | 7 |
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