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长孔
chem.	slot hole
tech.	slot; slotted hole
长圆孔
auto.	slotted hole
长方形孔
gen.	slot

长孔: 119 phrases in 25 subjects

Agriculture	1
Air defense	3
Architecture	1
Automobiles	4
Aviation	1
Bridge construction	2
Chemistry	3
Ecology	1
Electronics	3
Engineering geology	6
Exhibitions	1
Explosives and Explosive Ordnance Disposal	15
General	3
Geology	3
Hydroelectric power stations	1
Ichthyology	1
Metallurgy	1
Mining	1
Oil / petroleum	8
Rail transport	2
Shooting sport	1
Space	3
Technology	49
Textile industry	4
Wind Energy	1