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封闭式系统 : 27 phrases in 10 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Business | 2 |
| Earth sciences | 1 |
| Management | 1 |
| Metallurgy | 2 |
| Nautical | 2 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 15 |
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