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filtration f
agric.	filtrado n
environ.	filtración f
oil	refinación f; refinado n
soil.	percolación f

filtration : 132 phrases in 23 subjects

Agriculture	9
Chemistry	30
Construction	2
Earth sciences	10
Education	1
Electronics	1
Environment	32
Food industry	5
Food service and catering	1
General	1
Geology	5
Industry	4
Laboratory equipment	4
Materials science	1
Mechanic engineering	2
Medical	9
Metallurgy	4
Natural sciences	1
Patents	1
Technology	5
Textile industry	1
Waste management	1
Water resources	2