This circuitry shifts the carrier wave to a higher frequency when it wants to send a 1, or to a lower frequency when it wants to send a 0.

这个电路在1将载波频率调高，0将载波频率调低。

And so he realized that the earth itself was alive with electricity and perhaps could be used as a carrier wave.

于是他意识到地球本身满了电，并且或许可以作为载波使用。

Note that the comparison to a traffic light, which emits one color and then another, is a little inaccurate, because your smartphone's circuitry generates one frequency, called a carrier wave.

需要注意的是， 将蓝牙信号比作交通灯，交通灯会依次出不同颜色的光，这种比喻有点不准确， 因为你的能手机电路只会生成一个频率，称为载波。