A type of transmission medium consisting of two insulated wire twisted together to improve its immunity to interference from other(stray) electrical signals that may otherwise corrupt the signal being transmitted.由两根外皮绝缘的导线扭在一起组成的一种类型的传输媒体，扭在一起是为提高对可能破坏被传输信号的其它(杂散)电信号的抗扰度。
