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三角矩 : 31 phrases in 10 subjects |
| Bridge construction | 1 |
| Business | 2 |
| Chemistry | 3 |
| Construction | 1 |
| Mathematics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Programming | 1 |
| Space | 2 |
| Technology | 17 |
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