4－Wire Circuit 四线电路： 是经常采用的在一对计算机之间异步串口连接的接线方案。一对接线用来在一个方向传输数据，另一对接线用来相反方向传输数据，四线电路通常用于比三线电路更长的距离。
四路无线电导航 radio range ; four-course
四航路无线电导航台 Four-Course Radio Range
三相四线桥式整流电路 three-phase four-wire-bridge rectifier circuit
四线[制]电路 four-wire circuits
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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.
该方法系统结构简单，不仅适用于单相电路，而且也适用于三相四线电路。
The system structure of this algorithm is simple . It not only fits for single-phase circuit, but also for three-phase circuit.
事实上，可以不使用任何线来建立四线电路，例如通过微波、卫星或红外传输系统。
In fact, a four - wire circuit can be established without the use of any wires at all, as in the case with a circuit established over microwave, satellite, or infrared transmission systems.
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