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专 题 图 : 44 phrases in 12 subjects |
Agriculture | 2 |
Animal husbandry | 1 |
Cartography | 3 |
Desert science | 1 |
Earth sciences | 7 |
Ecology | 3 |
Forestry | 2 |
Geography | 1 |
Geophysics | 1 |
Hydroelectric power stations | 1 |
Space | 4 |
Technology | 18 |