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material system
avia. 物质系统; 材料系统
material system
: 114 phrases in 19 subjects
Air defense1
Aviation46
Business6
Commerce1
Cryptography1
Economy7
Electronics19
Environment1
General3
Information technology1
International Monetary Fund2
Management3
Mechanics2
Metallurgy8
Planning1
Space3
Steel production1
Technology7
Textile industry1

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