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открытая дрена stresses
agric.	open ditch
construct.	interception drain; open drain
ecol.	open-cut drain; ditch drain; drain ditch; drainage ditch; ditch; interception
hydr.	absorption trench; draining trench
hydrol.	open cut drain
Makarov.	catchwater drain; opencut drain; surface drain
melior.	draining ditch (Leonid Dzhepko)
tech.	intercepting ditch; drainage channel; grip; drainditch; intercepting channel
открытые дрены
construct.	surface trenches
railw.	surface tranches

открытая дрена: 12 phrases in 5 subjects

Agriculture	1
Makarov	3
Mining	1
Road works	1
Technology	6