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河系 héxì
desert.	fluvial system
hydroel.st.	river system; stream system
oil	water system
tech.	hydrographic net; hydrographical network

河系: 143 phrases in 25 subjects

Air defense	2
Architecture	2
Astronomy	2
Aviation	1
Bridge construction	1
Business	1
Desert science	3
Earth sciences	6
Ecology	4
Electronics	3
Engineering geology	3
Environment	1
General	6
Geology	3
Hydrology	1
Nautical	1
Oil / petroleum	4
Physics	1
Project management	1
Space	18
Technology	71
Telecommunications	1
United Nations	2
United States	1
Water resources	4