You all know how when you take a crystal prism and pass a beam of sunlight through it, you get a spectrum, which looks like a continuous band of rainbow colors.
你们都知道，拿起一个水晶棱镜，让一束阳光通过它，就会得到一个光谱，看起来就像一条连续的彩虹色带。
2
Visible light consists of different colors or wavelengths, which together make up what's called spectrum, a band of colors, like you see in a rainbow.
可见光由不同的颜色或波长组成，它们共同组成了所谓的光谱（一段颜色），就像你在彩虹中看到的那样。
3
The same is true of wireless spectrum and the unregulated band where wifi devices operate is the best example of this.