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换 土: 65 phrases in 14 subjects |
Agriculture | 10 |
Bridge construction | 4 |
Chemistry | 1 |
Earth sciences | 4 |
Ecology | 5 |
Electronics | 1 |
Engineering geology | 3 |
Hydroelectric power stations | 4 |
Metallurgy | 1 |
Oil / petroleum | 1 |
Oil processing plants | 2 |
Rail transport | 3 |
Soil science | 1 |
Technology | 25 |