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matière active
agric.	active principle; active substance; active ingredient
chem.	active material
med.	active materials
nucl.phys., радиоакт.	active material (of a semiconductor detector, d'un détecteur semi-conducteur)
радиоакт.	active detector material (d'un détecteur semi-conducteur)
matières actives
construct.	active materials

matière active: 12 phrases in 8 subjects

Accumulators	1
Agriculture	3
Chemistry	2
Coal	1
Electrochemistry	1
Natural resourses and wildlife conservation	2
Social science	1
Work flow	1