The second theory is called " Signalling" .

其二是" 信号传递" 理论。

Additional long calls signaled changes in direction.

额外的长时间呼唤意味着方向的改变。

Frederick Stanley Mockford created the mayday call signal in the nineteen twenties.

20世纪20年代，Frederick Stanley Mockford创造了这个求救信号。

A top White House official called that an 'interesting signal.'

白宫一位高级官员称这是一个“有趣的信号”。

The information that markets generate to guide a distribution of resources is what economists call price signals.

经济学家们所称的价格信号是市场为引导资源分配所产生的信息。

Jeff really nailed it because we call our signal a gravitational wave background signal for historical reasons.

杰夫说得很对，因为出于历史原因，我们称我们的信号为“引力波背景信号”。

What is actually going on here is that this is using a UNIX communication mechanism called signals.

这里实际发生的是，这是使用称为信号的 UNIX 通信机制。

This kind of signalling system called the AIS — boats use this to make sure that their location is constantly known.

这种称为 AIS 的信号系统——船只使用它来确保它们的位置始终为人所知。

He called the agreement a strong signal against protectionist pressures, in favor of a world open to trade, without unilateral sanctions and without the threat of trade wars.

他认为，新版协定是反对贸易保护主义压力的强烈信号，是对世界公开贸易的支持，也是对单边制裁和贸易战争威胁的抗争。

Five sigma basically means that there's a 1 in 3.5 million chance that the signal they're seeing is a coincidence, a fluke Only at five sigma are physicists ready to call a signal real.

五西格玛基本上意味着他们看到的信号有 350 万分之一的几率是巧合，侥幸只有在五西格玛时，物理学家才准备好将信号称为真实信号。