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to phrases
river system
ecol.
河流系统
hydroel.st.
河系
;
水系
;
水系
河网
;
河道网
tech.
河网
river system
:
38 phrases
in 10 subjects
Air defense
1
Bridge construction
1
China
1
Desert science
1
Earth sciences
4
Ecology
3
Engineering geology
3
Technology
20
United Nations
2
Water resources
2
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