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percolating filter
construct.	filtre bactérien goutte-à-goutte
ecol.	filtre biologique; filtre percolateur; biofiltre m; lit percolateur
environ.	lit bactérien; filtre à lit percolateur
med.	filtre à percolation

percolating filter: 6 phrases in 2 subjects

Environment	3
Natural resourses and wildlife conservation	3