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| circulate | |||
| revolve | |||
| cycle | |||
| 使循环: 24 phrases in 15 subjects |
| Aviation | 3 |
| China | 1 |
| Commerce | 1 |
| Ecology | 1 |
| Economy | 2 |
| Electronics | 2 |
| General | 2 |
| Nuclear physics | 1 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Refrigeration | 1 |
| Securities | 1 |
| Technology | 5 |
| Telecommunications | 1 |
| Textile industry | 1 |
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