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| 水污染 水平: 50 phrases in 9 subjects |
| Automobiles | 1 |
| Earth sciences | 7 |
| Ecology | 2 |
| Electronics | 5 |
| Environment | 3 |
| Nuclear and fusion power | 1 |
| Technology | 24 |
| Water resources | 5 |
| Wind Energy | 2 |
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