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поверхностный дренаж stresses
agric.	top draining
construct.	surface drainage
ecol.	external drainage
hydroel.st.	outward drainage (HelenDZ)
Makarov.	ditch drainage; gutter drainage; open ditch drainage; open drainage; open-channel drainage; top raining
road.wrk.	surface downpipe

поверхностный дренаж: 2 phrases in 2 subjects

Construction	1
Thermal engineering	1