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环 流 机 : 17 phrases in 9 subjects |
| Automobiles | 1 |
| Drilling | 1 |
| Electric machinery | 5 |
| Electronics | 2 |
| Hydroelectric power stations | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 3 |
| Wind Energy | 2 |
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