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| 正循环; 直接循环 | |||
| 直接空气循环 | |||
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| 直接循环的 | |||
| direct cycle: 20 phrases in 5 subjects |
| Animal husbandry | 1 |
| Electronics | 11 |
| General | 2 |
| Space | 2 |
| Technology | 4 |
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