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mean height stresses
gen.	средний рост (Dollie)
avia.	средняя высота (полёта)
forestr.	средняя высота (насаждения)

mean height: 22 phrases in 14 subjects

Artillery	1
Automated equipment	1
Cartography	1
Ecology	3
Forestry	2
Hydraulic engineering	2
Hydrology	3
Metallurgy	1
Meteorology	2
Military	1
Natural resourses and wildlife conservation	2
Roll stock	1
Technology	1
Weapons and gunsmithing	1