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观察孔 guānchákǒng
gen.	bolthole; glory-hole; viser
archit.	access opening; inspecting hole; visor
auto.	access hole; eyesight; hand hole; observation slit; sighting slit; view slit; vision slit
chem.	peep door
dril.	inspection door; observer
el.	looking glass; viewport; inspection port
eng.geol.	sight glass
hydroel.st.	aperture of sight
met.	eye hole; eye-sight; observation opening; observation port; observation window; peep; peep hole; sight; sight-hole; sight tube; sight window; viewing port; viewing window; wicket; window
nautic., tech.	observer's porthole
oil	eyehole; spy hole
plast.	inspection glass
refrig.	glass
space	porthole; sight hole; sight port
tech.	disconnecting manhole; eye slit; look box; loophole; observation door; observation well; spyhole; viewing hole; viewing slot; peep window
therm.energ.	inspection hole
wind.	access hatch; loop; observation hole
观察〔窥视〕孔
gen.	peepdoor; sightglass
观察孔〔窗〕 guānchákǒng
gen.	visard; visor; vizard; vizor
观察〔窥视〕孔
IT	sight glass
tech.	eye sight
观察窥视孔
archit.	sight channel
auto.	sight hole; sight port
观察〔检验，检测〕孔
gen.	inspection hole
观察〔检査，窥视，人〕孔
gen.	sight-hole
观察测孔
auto.	port viewing
观察〔检査〕孔〔门〕
transp.	inspection door
观察〔观测，目视〕孔
gen.	eyesight
观察〔观测，窥视〕孔〔窗〕
gen.	peephole
观察检查孔
archit.	observation hole
观察检查孔口
auto.	inspection eye
观察看火孔
met.	glory-hole

观察 孔: 34 phrases in 11 subjects

Automobiles	3
Compressors	1
Drilling	1
Electronics	1
Explosives and Explosive Ordnance Disposal	1
General	2
Metallurgy	7
Oil / petroleum	2
Space	1
Technology	14
Textile industry	1