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double line
angl.	双股线
busin.	二重线
econ.	双线
tech.	重叠线; 双线 (线路); 双线 (段); 双轨; 双管线
textile	双线线缝
transp.	双轨〔线〕
wind.	复线
double-line
gen.	双〔复〕线的
hydroel.st.	双线; 复线
doubles line
tab.tenn.	中线

double line: 116 phrases in 21 subjects

Agriculture	1
Automobiles	1
Badminton	2
Bridge construction	7
Commerce	1
Compressors	1
Construction	1
Earth sciences	1
Electronics	14
Explosives and Explosive Ordnance Disposal	1
General	1
Hydroelectric power stations	5
Librarianship	1
Metallurgy	2
Rail transport	4
Shipbuilding	2
Space	2
Technology	61
Telecommunications	1
Tennis	1
Textile industry	6