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磁力线 |
magnetic-line of force : 33 phrases in 12 subjects |
Air defense | 1 |
Automobiles | 1 |
Aviation | 1 |
Chemistry | 2 |
Electric machinery | 2 |
Electronics | 2 |
Geophysics | 3 |
Information technology | 2 |
Metallurgy | 5 |
Oil / petroleum | 5 |
Space | 2 |
Technology | 7 |