| |||
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 |