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channel of main stream |
主槽 : 32 phrases in 10 subjects |
Bridge construction | 2 |
Electric machinery | 2 |
Electronics | 2 |
Engineering geology | 1 |
General | 3 |
Household appliances | 1 |
Hydroelectric power stations | 5 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Technology | 13 |