Garter snakes detect a chemical signal from earthworms—one of their favorite foods—via the VNO, and they use this signal to track their prey.

束带蛇通过 VNO 探测到来自蚯蚓（它们最喜欢的食物之一）的化学信号，然后它们利用这个信号来追踪它们的猎物。

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If they detect something wrong while the system is armed, they'll transmit a wireless alert signal to a base station that will then raise the alarm.

如果他们在系统布防时发现了什么问题，就会向基站发送无线警报信号，然后基站会发出警报。

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Prior to this, the signal may have been harder to detect.

在此之前，很难察觉得到蛛丝马迹。

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The robot can detect the brain signal corresponding to a person thinking about moving an arm, and then move the arm.

CNN: Brain-controlled devices may help paralyzed people

However, if there is a lot of noise (interference) on the channel the receiver is listening to, it cannot detect the intended signal because it is covered by noise.

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But it is possible to detect minute deviations in this signal, and these fluctuations - seen as mottling in the map - are understood to reflect the differences in the density of matter when the light parted company and set out on its journey all those years ago.

BBC: Planck satellite: Maps detail Universe's ancient light