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| 废塑料; 再生塑料 | |||
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waste plastic : 15 phrases in 7 subjects |
| Chemistry | 1 |
| Ecology | 1 |
| Environment | 1 |
| Metallurgy | 2 |
| Plastics | 2 |
| Polymers | 1 |
| Technology | 7 |
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