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двухслойный фильтр stresses
auto.	dual layer filter
construct.	sandwich-filter
ecol.	double-bed filter; double-layer filter; dual-media filter
el.	double layer filter; layered bed; stratified bed; twin-layer filter
tech.	two-bed polisher

двухслойный фильтр: 7 phrases in 3 subjects

Electronics	4
Energy industry	1
Transport	2