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栓孔
hydroel.st.	pinhole
tech.	key hole
栓钥匙孔
archit.	keyhole

栓孔: 86 phrases in 16 subjects

Architecture	4
Automobiles	10
Bridge construction	1
Chemistry	2
Drilling	2
Electric machinery	2
Explosives and Explosive Ordnance Disposal	1
Metallurgy	2
Nautical	2
Oil / petroleum	1
Plastics	1
Rail transport	4
Reproductive biology	1
Shipbuilding	3
Technology	46
Wind Energy	4