With two diodes in parallel back to back, the circuit will provide protection regardless of the signal polarity.

由于两个二极管反向并联，所以此电路能够对任何极性的信号进行保护。

youdao

Back-to-back monthly declines in CPI may be a warning signal that deflation is gaining a toehold.

在消费物价指数回至后端月下滑可能是一个警告信号，表明通货紧缩正在获得一个立足点。

youdao

The invention discloses a back-off method and a back-off device, and a method and a device for detecting a radio-frequency identification signal state, and belongs to the field of communications.

本发明公开了一种退避方法和装置及检测射频识别信号状态的方法和装置，属于通信领域。

youdao

Today,VOA broadcasts to satellites in space that send the signal back to stations on the ground that transmit programs with a clear signal.

VOA: special.2010.12.08

The device sends a signal to a computer at the back of the car.

VOA: special.2009.11.03

So it's not the journey that's slowing things down, it's the conversion from electronic signal to light and light back to electronic signal.

CNN: Surfing at the speed of light

Journalists seeking balancing perspectives sometimes do not even interview corporate scientists, or if they do, they relegate their comments to the back end of their piece to signal to the reader that they do not take industry views as highly credible.

FORBES: The Politics of Obesity: Here Comes the NGO -- Media -- Class Action Bar Complex

It's converted back to an electronic signal when it reaches its destination.

CNN: Surfing at the speed of light