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| system constraint | |||
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系统 约 束 : 43 phrases in 10 subjects |
| Automobiles | 20 |
| Aviation | 7 |
| Bridge construction | 1 |
| Business | 1 |
| Earth sciences | 4 |
| Electronics | 2 |
| Metallurgy | 1 |
| Space | 1 |
| Sports | 2 |
| Technology | 4 |
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