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main track | |||
main line |
主线路 : 62 phrases in 13 subjects |
Architecture | 1 |
Automobiles | 6 |
Aviation | 2 |
Bridge construction | 3 |
Business | 1 |
Communications | 1 |
Electronics | 15 |
General | 1 |
Information technology | 4 |
Oil / petroleum | 1 |
Space | 1 |
Technology | 24 |
Telecommunications | 2 |