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normal axis [‘nɔ:m(ə)l 'æksɪs]
agric.	垂直轴线
archit.	垂直轴 (线)
auto.	法向轴线
bridg.constr.	法轴; 正交轴
met.	垂直轴线; 法线轴
space	法向轴
tab.tenn.	球垂直轴; 球的垂直轴
wind.	垂直轴

normal axis: 3 phrases in 2 subjects

Aviation	1
Space	2