ring main
noun /ˈrɪŋ meɪn/
/ˈrɪŋ meɪn/
(specialist)- an arrangement of cables that allows electricity to be supplied to a series of places from either of two directions
(电路的)环形干线 - (also ring circuit)(specialist) an arrangement of wires that supply electricity to several different places in a room or building
(电路的)环形干线 - an arrangement of connected pipes that allows water, steam, etc. to enter and leave a system
(管路的)环形主线