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на больших глубинах stresses
math.	at great depth
nautic.	off soundings (недоступных для измерения ручным лотом)
на большой глубине
gen.	deeply
nautic.	off soundings
на большую глубину
gen.	deeply

на больших глубинах: 93 phrases in 27 subjects

Armored vehicles	1
Automated equipment	1
Ecology	1
Electronics	4
Energy industry	5
Fishery fishing industry	1
Gas processing plants	1
General	2
Geology	5
Gold mining	1
Hydrology	1
Makarov	5
Mathematics	2
Military	19
Mining	6
Nautical	5
Navigation	2
Oceanography & oceanology	3
Oil / petroleum	7
Oil and gas	9
Oil and gas technology	4
Road works	1
Seismology	1
Shipbuilding	1
Submarines	1
Technology	2
United Nations	2