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回水管 huíshuǐguǎn
archit.	wet return line
ecol.	return water pipe; return tube
eng.geol.	return
hydroel.st.	return pipe; return line
refrig.	circulation return pipe
tech.	returning tube; return water piping; return water tube; return water tubing; water return pipe; condensate return
water.res., ecol.	backwater pipe
回水总管
tech.	return line

回水 管 : 75 phrases in 17 subjects

Agriculture	1
Architecture	1
Automobiles	1
Construction	2
Ecology	4
Electric machinery	1
Electronics	4
Engineering geology	1
Hydroelectric power stations	7
Metallurgy	2
Mining	1
Nautical	1
Oil / petroleum	3
Refrigeration	3
Shipbuilding	1
Space	1
Technology	41