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周期地
tech.
periodically
周期地
:
50 phrases
in 14 subjects
Agriculture
1
Animal husbandry
1
Aviation
1
Bridge construction
4
Drilling
1
Earth sciences
5
Economy
1
Engineering geology
3
General
1
Geophysics
1
Hydroelectric power stations
5
Oil / petroleum
1
Space
1
Technology
24
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