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曲线 包络 : 17 phrases in 10 subjects |
| Architecture | 3 |
| Bridge construction | 2 |
| Business | 2 |
| Ecology | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 4 |
| Marketing | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 1 |
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