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古河道
bridg.constr.	fossil river course; abandoned stream channel
cartogr.	abandoned channel
desert.	ancient channel; ancient course; former river course; palaeochannel
el.	old river diversion
eng.geol.	old course; palaeostream
hydroel.st.	old river; ancient river course; paleochannel; old stream; old channel; buried channel; buried river
oil	ancient stream channel; fossil stream channel
tech.	fossil stream course

古河道: 4 phrases in 3 subjects

Desert science	1
Oil / petroleum	1
Technology	2