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Hauptachsen f
gen.	arm primary axes
IT	major axes
Hauptachse f =, -n
gen.	rotational axis
el., acoust.	reference axis
math.	principal axis
med.	monopodium
phys.	preferred axis; privileged axis
scient.	centerline
tech.	main axis; transverse axis; major axis

Hauptachsen: 5 phrases in 3 subjects

Agriculture	2
Communications	1
Construction	2