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洋底 yángdǐ
hydroel.st.	ocean floor
oil	ocean bottom; ocean bed
tech.	ocean-floor
洋〔海〕底
earth.sc.	ocean floor
geophys.	ocean bottom
洋底面 yángdǐ
gen.	fondo
洋 底
navig.	ocean bottom

洋底: 89 phrases in 17 subjects

Aviation	1
Construction	1
Desert science	1
Drilling	2
Earth sciences	14
Ecology	1
Electronics	1
Engineering geology	1
General	4
Geology	3
Hydroelectric power stations	2
Navigation	4
Oceanography & oceanology	1
Oil / petroleum	11
Statistics	2
Technology	36
United Nations	4