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污染物 化学 : 31 phrases in 10 subjects |
| Ecology | 2 |
| Environment | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Refrigeration | 1 |
| Shipbuilding | 1 |
| Sports | 1 |
| Technology | 19 |
| Water resources | 3 |
| Wind Energy | 1 |
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