double-rail logic
... 双线螺旋 bifilar helix; 双线逻辑 double rail logic; 双线屏蔽电缆 two-conductor shielded cable; ...
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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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