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to phrases
lower stage
space
下面级
low stage
tech.
低水位
lower stage:
44 phrases
in 15 subjects
Air defense
1
Aviation
2
Bridge construction
1
Chemistry
1
Desert science
3
Ecology
1
Electronics
3
Hydraulics
1
Hydroelectric power stations
1
Metallurgy
2
Oil / petroleum
2
Plastics
1
Refrigeration
2
Space
1
Technology
22
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