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入孔 rùkǒng
avia.	manhole
bridg.constr.	entry hole
busin.	hatch
space	access opening; access port; access hole
tech.	inlet

入孔: 158 phrases in 21 subjects

Automobiles	10
Aviation	1
Bridge construction	6
Business	2
Construction	1
Desert science	1
Drilling	1
Earth sciences	2
Ecology	2
Electric machinery	1
Electronics	5
Engineering geology	3
Football	2
Geophysics	1
Mathematics	1
Metallurgy	12
Mining	5
Oil / petroleum	17
Space	2
Technology	82
Telecommunications	1