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key material | |||
primary material | |||
main material; major processed materials | |||
parent material | |||
main materials; primary materials; principal member |
主要材料 : 22 phrases in 13 subjects |
Aviation | 3 |
Business | 4 |
Chemistry | 1 |
Ecology | 1 |
Economy | 1 |
Finances | 1 |
Furniture | 1 |
Hydroelectric power stations | 1 |
Management | 1 |
Metallurgy | 2 |
Technology | 4 |
Watchmaking | 1 |
Wood processing | 1 |