That is until about two days after an ant's passing, Ed discovered, when the corpse appears to emit a chemical signal that changes the living ants' behavior dramatically.

直到两天后一只蚂蚁经过，艾德·威尔逊发现，尸体似乎放出了一种化学信号，戏剧性地改变了（其他）活蚂蚁的行为。

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That way, the device responds quicker than it would if it had to download the data for triangulation each time from Apple, or wait a minute or so for the faint signal from a passing GPS satellite.

通过这种三角定位的方式，如果设备必须要从苹果上下载东西的时候，它每次的响应速度会比较快，否则的话，需要等待一分钟左右，以便接收经过的GPS卫星发出的微弱信号（进行定位）。

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Pixelation occurs when the digital signal bounces off buildings, hillsides, trees or even passing aircraft.

数字信号在建筑物、山坡、树木或者甚至掠过飞机时，会发生发射，这时会出现像素问题。

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This is a signal - this passing of phosphorous - is a signal that's used very frequently in intracellular communication.

这是一种信号,一种通过磷酸来传递的信号,这种信号在细胞内通讯时经常被用到

耶鲁公开课 - 生物医学工程探索课程节选

Another mote inside that range picks up the first one's signal and grabs its data, adding readings of its own and passing the package along to a third mote.

FORBES: Sensing Opportunity

On the observation deck was a tarp-covered signal light, which Burke, an ex-Navy lieutenant, likes to flash at passing ships.

NEWYORKER: Bones of Contention