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circuit
Noun
mạch
the complete circle through which an electric current flows, typically consists of the source of electric energy
"The current in the circuit can be measured using an ammeter ."
closed-circuit television
Noun
truyền hình mạch kín, hệ thống camera giám sát
a system in which a number of cameras send their feed to television sets to protect a place and its occupants from crime
"During the event , security personnel monitored the crowd using closed-circuit television feeds ."