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digital cassettes |
数 字磁带 : 50 phrases in 13 subjects |
Agriculture | 3 |
Aviation | 3 |
Chemistry | 2 |
Computers | 1 |
Earth sciences | 10 |
Electronics | 16 |
Engineering geology | 1 |
Geophysics | 2 |
Information technology | 1 |
Metallurgy | 1 |
Multimedia | 6 |
Project management | 1 |
Space | 3 |