名词
中文翻译：并行线
同义词：
['parallel line', 'parallel circuit']
例句：
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1. The PNP transistor is a type of electronic device that switches currents in both directions.
PNP晶体管是一种电子器件，能在两个方向上切换电流。
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2. In parallel lines, the current flows from one end to the other without any interruption.
在平行线路中，电流从一端流向另一端，没有中断。
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3. The PNP transistor was invented by Bell Labs in 1960 and has since become astandard component in many electronic devices.
PNP晶体管是由贝尔实验室在1960年发明的，自那以后已成为许多电子设备的标准组件。