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рельеф морского дна stresses
gen.	seabed topography (twinkie)
cartogr.	submarine relief; underwater topography
geophys.	sea-floor relief; seafloor topography; seabed features (S. Manyakin)
Makarov.	conformation of the seabed
nautic.	sea bottom contour
tech.	submarine topography

рельеф морского дна: 3 phrases in 3 subjects

Nautical	1
Oil and gas	1
United Nations	1