四線電路
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【計】 four-wire circuit例句：
- 用來派生一個幻象電路的電路結構。在四線電路中，與“去程”通道相關聯的兩線就形成了一個“半邊電路”，而與“回程”通道相關聯的兩線構成了另一個“半邊電路”。A circuit arrangement for deriving a phantom circuit. In four wire circuits, the two wires associated with the "GO" channel form one "side circuit", and those associated with the "return" channel form another.