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живое сечение сита stresses
cem.	screen surface
energ.ind.	effective screening area (напр., углеразмольной мельницы на ТЭС)
food.ind.	net sieving area
oil	screening surface
silic.	free area of screen; screen area; screening area; useful screen area
tech.	effective screening area; open space of screen; open space of a screen

живое сечение сита: 4 phrases in 3 subjects

Natural resourses and wildlife conservation	1
Oil and gas	2
Plastics	1