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| oxygen cycle | |||
| cycle of oxygen | |||
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氧循 环 : 33 phrases in 11 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Desert science | 1 |
| Ecology | 3 |
| Electronics | 1 |
| Environment | 1 |
| General | 1 |
| Metallurgy | 1 |
| Space | 4 |
| Technology | 14 |
| Water resources | 5 |
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