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| 节约用水 | |||
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saving water : 38 phrases in 9 subjects |
| Agriculture | 5 |
| China | 2 |
| Earth sciences | 2 |
| Ecology | 8 |
| Engineering geology | 3 |
| Environment | 1 |
| Metallurgy | 1 |
| Technology | 15 |
| Water resources | 1 |
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