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单词 ring main
释义 ring mainBrE /ˈrɪŋ meɪn/NAmE /ˈrɪŋ meɪn/ noun (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 = ring circuit an arrangement of connected pipes that allows water, steam, etc. to enter and leave a system (管路的)环形主线
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