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作用球
space
activity sphere
作用球:
41 phrases
in 17 subjects
Agriculture
1
Animal husbandry
1
Aviation
1
Desert science
1
Earth sciences
3
Electronics
1
Engineering geology
1
General
3
Ice hockey
1
Metallurgy
1
Oil / petroleum
1
Reproductive biology
1
Space
3
Sports
1
Technology
18
United Nations
2
United States
1
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