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| air ring; cooling ring | |||
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空冷环 : 48 phrases in 12 subjects |
| Animal husbandry | 1 |
| Architecture | 2 |
| Aviation | 16 |
| Chemistry | 1 |
| Electric machinery | 5 |
| Electronics | 2 |
| Hydroelectric power stations | 1 |
| Plastics | 2 |
| Refrigeration | 6 |
| Space | 2 |
| Technology | 8 |
| Wind Energy | 2 |
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