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备用线路
el. side track
geophys. backup circuit
IT standby line
met. spare line
tech. extension wire; spare circuit
telecom. alternate line; reserve line
UN, econ. backup lines for services such as steam and water
备用线路: 26 phrases in 11 subjects
Air defense1
Electronics8
General1
Geophysics2
Hydroelectric power stations1
Information technology1
Metallurgy1
Space1
Technology8
Telecommunications1
United Nations1

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