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природные материалы stresses
gen.	matières nobles (дерево, камень, шерсть и т.п.)
construct.	matériaux naturels; matériaux pierreux naturels; pierres naturelles
природный материал
construct.	produit naturel
environ.	matériaux naturels
tech.	matière première

природные материалы: 6 phrases in 5 subjects

Construction	1
Electronics	1
Forestry	2
Geology	1
Hydraulic engineering	1