Getting a DNT signal does not oblige anyone to stop tracking, although some companies have promised to do so.

获得 DNT 信号并不意味着任何人都必须停止跟踪，尽管一些公司已经承诺会这样做。

youdao

With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?

通过将正确的设备调整到正确的频率，如何防止小偷干扰你的设备阻止警报信号到达基站呢？

youdao

If you're doing something you hate, it's a clear signal from your body, mind and soul telling you to stop torturing yourself.

当你在做你讨厌的事情时，它是来自你身体、思想和心灵要求你停止折磨自己的清晰信号。

youdao

In 1988, two trains collided in the Bronx after an engineer apparently ran through a red stop signal.

WSJ: Train Derailment Injures Dozens

On the night of July 23, 2011, when trains began to stack up, dispatchers and maintenance staff raced to repair the faulty signal and ignored the simplest solution: stop the trains and regain the signal.

NEWYORKER: Boss Rail

That would stop the radio signal needed to take money off your bankcard.

BBC: London bus contactless system charging wrong cards