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点 轨迹 : 41 phrases in 12 subjects |
| Athletics | 2 |
| Automobiles | 1 |
| Aviation | 5 |
| Bridge construction | 3 |
| Construction | 1 |
| General | 2 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 4 |
| Polymers | 1 |
| Space | 5 |
| Technology | 15 |
| Telecommunications | 1 |
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