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two-layer equation |
双层式 : 44 phrases in 13 subjects |
Bridge construction | 2 |
Construction | 1 |
Electric machinery | 1 |
Electronics | 2 |
Engineering geology | 3 |
General | 2 |
Gymnastics | 1 |
Metallurgy | 4 |
Project management | 1 |
Rail transport | 2 |
Space | 1 |
Technology | 20 |
Textile industry | 4 |