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正态函数 : 24 phrases in 9 subjects |
| Bridge construction | 4 |
| Business | 4 |
| Earth sciences | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 2 |
| Mathematics | 2 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 6 |
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