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couche filtrante
agric., construct.	filter layer; filter material; filtering layer
agric., mech.eng.	filter bed
construct.	filtering charge; filtering mass; filtering body
environ., tech.	filter medium
health.	clarifying layer
nat.res.	filter layer (water treatment); filtering layer (water treatment)
transp., polit.	filter course

couche filtrante: 3 phrases in 2 subjects

Construction	2
Cultural studies	1