| 词汇 | 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 circuitan 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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