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混合鼓 : 19 phrases in 8 subjects |
| Chemistry | 1 |
| Ecology | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Otorhinolaryngology | 1 |
| Plastics | 9 |
| Polymers | 1 |
| Technology | 2 |
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