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海底管道 hǎidǐ guǎndào
archit.	submarine pipe line; submerged pipeline
ecol.	pipeline
eng.geol.	seabed pipeline; undersea pipeline
hydroel.st.	submarine conduit
met.	submarine pipeline
oil, transp.	pipe line under the ocean
tech.	offshore pipeline; sea-going pipeline; submarine line; subsea pipeline

海底管道: 8 phrases in 5 subjects

Ecology	1
General	1
Metallurgy	1
Nautical	2
Oil / petroleum	3