It is because a conductor carrying is surrounded by a magnetic field.

这就是因为载流导体周围有一磁场。

youdao

Shielding may also be applied to a conductor carrying a high level test voltage to prevent interference with nearby low level circuits.

承载高测试电压的导体也应该采用屏蔽，以防止与邻近的低电平电路发生干扰。

youdao

An unbalanced line is generally a single-conductor shielded cable with the center conductor carrying the signal and the shield at ground potential.

对于非平衡式信号线来说，就是一根被屏蔽了的信号线，这个中心信号线传输信号，且相对于地电势。

youdao

Showed what I thought was my ticket to the conductor, who most politely and in immaculate English told me I was carrying a piece of paper saying my credit card had been refused, and next time to buy a ticket at the counter.

FORBES: Closet Supply Siders

Everton, with Mikel Arteta their conductor in central midfield, were showing the neater passing play against a Birmingham side looking solid without carrying much of an attacking threat.

BBC: Birmingham 0-2 Everton