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电，并且或许可以作为波使用。

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.

这个电路在发送1时将波频率调高，发送0时将波频率调低。

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， 将号比作交通灯，交通灯会依次发出不同颜色的光，这种比喻有点不准确， 因为你的智能手机电路只会生成一个频率，称为波。