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包装回收 : 11 phrases in 9 subjects |
| Agriculture | 1 |
| Chemistry | 1 |
| Ecology | 1 |
| Economy | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Technology | 3 |
| Textile industry | 1 |
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