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понижение уровня stresses
avia.	Pegelsenkung f (напр., шума)
el.	Niveausenkung f
geol.	Vertiefung f
geophys.	Niveaudepression n
hydrol.	Spiegelabsenkung m (воды); Spiegelsenkung f (воды)
mining.	Spiegelsenkung f (грунтовых вод)
oil	Spiegelabsenkung m
tech.	Spiegelsunk m

понижение уровня: 97 phrases in 21 subjects

Aerodynamics	1
Construction	10
General	1
Geology	7
Geophysics	3
Hydrography	3
Hydrology	10
Law	1
Management	1
Military	3
Mining	10
Natural resourses and wildlife conservation	2
Navy	1
Oceanography & oceanology	3
Oil / petroleum	2
Quantum electronics	1
Rail transport	3
Road works	7
Technology	6
Telecommunications	1
Water supply	21