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to phrases
柱段
tech.
shell of column
柱段:
39 phrases
in 12 subjects
Automobiles
5
Aviation
3
Biotechnology
1
Drilling
1
Electronics
1
Explosives and Explosive Ordnance Disposal
3
Oil / petroleum
5
Plastics
1
Refrigeration
1
Space
1
Sports
4
Technology
13
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