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双线电路
two-wire circuit
- 尽管四线电路的绝对成本高于双线电路，但它显著地改进了性能。
Although the absolute cost of four - wire circuits is higher than that of two - wire circuits, they offer considerably improved performance. - 换句话说，电路可以是物理双线(甚至是物理单线)、逻辑四线，它使用较少的线实现四线电路。
In other words, the circuit may be physical two - wire (or even physical one - wire) and logical four - wire, performing as a four - wire circuit but employing fewer than four wires.
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