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加重料 : 38 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Chemistry | 3 |
| Drilling | 5 |
| Metallurgy | 1 |
| Oil / petroleum | 6 |
| Plastics | 8 |
| Space | 2 |
| Technology | 11 |
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