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material reference
avia.	材料参考; 参考材料

material reference : 58 phrases in 16 subjects

Agriculture	1
Aviation	4
Biotechnology	3
Chemistry	21
Earth sciences	3
Electronics	4
Foreign trade	1
Geophysics	1
Metallurgy	1
Nuclear physics	1
Scientific	1
Sealing	1
Space	4
Technology	10
United Nations	1
Water resources	1