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增强层 : 48 phrases in 13 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| Bridge construction | 1 |
| Chemistry | 3 |
| Electronics | 3 |
| Geophysics | 2 |
| Metallurgy | 1 |
| Nautical | 3 |
| Plastics | 8 |
| Polymers | 8 |
| Space | 2 |
| Technology | 13 |
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