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扩展裂纹 : 75 phrases in 13 subjects |
| Automobiles | 1 |
| Aviation | 4 |
| Chemistry | 1 |
| Construction | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 36 |
| Oil / petroleum | 4 |
| Plastics | 1 |
| Polymers | 2 |
| Space | 6 |
| Steel production | 1 |
| Technology | 15 |
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