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middle layer | |||
core sheet | |||
central ply; central layer |
中心层 : 26 phrases in 14 subjects |
Architecture | 1 |
Aviation | 2 |
Cryptography | 1 |
Earth sciences | 2 |
Electronics | 3 |
Geophysics | 2 |
Metallurgy | 4 |
Nursing | 1 |
Oil / petroleum | 1 |
Plastics | 1 |
Space | 1 |
Technology | 2 |
Telecommunications | 3 |
United States | 2 |