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保 持措施 : 27 phrases in 11 subjects |
| Agriculture | 3 |
| Automobiles | 1 |
| China | 1 |
| Desert science | 2 |
| Earth sciences | 5 |
| Ecology | 5 |
| Forestry | 2 |
| Hydroelectric power stations | 3 |
| Scientific | 2 |
| Soil science | 1 |
| Technology | 2 |
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