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to phrases
secondary source
econ.
次级来源
;
第二手来源
el.
二次
中子
源
核
libr.
二次文献
;
二手资料
tech.
二次光源
secondary source:
21 phrases
in 9 subjects
Advertising
2
Aviation
2
Commerce
1
Electronics
4
Explosives and Explosive Ordnance Disposal
2
Nuclear and fusion power
2
Rail transport
1
Space
2
Technology
5
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