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непроницаемость n stresses
gen.	impermeabilita f; tenuta f
chem.	incompenetrabilità
construct.	impenetrabilità f; impermeabilità f
pack.	ermeticità f
phys.	impenetrabilita f; incompenetrabilita f
radio	opacificazione m
tech.	tenuta stagna

непроницаемость: 6 phrases in 4 subjects

General	1
Packaging	3
Physics	1
Textile industry	1