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| |||
| main circulation | |||
| main recirculation; major loop | |||
| main loop | |||
| major cycle | |||
| main cycle; primary cycle | |||
| 主循环: 14 phrases in 8 subjects |
| Aviation | 1 |
| Computer numerical control | 1 |
| Electronics | 2 |
| Nuclear and fusion power | 2 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 5 |
| Telecommunications | 1 |
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