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真空线 : 40 phrases in 14 subjects |
Animal husbandry | 1 |
Automobiles | 4 |
Aviation | 2 |
Earth sciences | 1 |
Ecology | 1 |
Electric machinery | 2 |
General | 1 |
Metallurgy | 4 |
Oil / petroleum | 1 |
Refrigeration | 2 |
Shipbuilding | 2 |
Space | 1 |
Technology | 17 |
Textile industry | 1 |