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控制 压力 系统 : 25 phrases in 9 subjects |
| Automobiles | 4 |
| Aviation | 9 |
| Electronics | 1 |
| Geophysics | 1 |
| Household appliances | 1 |
| Nuclear and fusion power | 1 |
| Space | 6 |
| Technology | 1 |
| United States | 1 |
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