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| pollution hazard | |||
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| 污染危害: 24 phrases in 9 subjects |
| Automobiles | 1 |
| China | 4 |
| Desert science | 1 |
| Earth sciences | 2 |
| Ecology | 6 |
| Engineering geology | 2 |
| Environment | 1 |
| Technology | 5 |
| Water resources | 2 |
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