That is because light is a form of electromagnetic radiation—in other words, a wave in which electric and magnetic fields continuously leapfrog each other.
那时因为光是以一种电磁辐射的形式存在的——换句话说，光就是一种波，在这种波里，电场与磁场不断地相互进行着交替作用。
Light is an electromagnetic wave, with a longer wavelength than X-rays and ultraviolet, and a shorter wavelength than infra-red, microwaves and radio waves.
光是一种电磁波，其波长长于X光和紫外线，短于红外线、微波和无线电波。
We can use the defect in the photonic crystal to guide the electromagnetic wave, and this photonic crystal with defect can be used to make photonic crystal devices.
利用光子晶体的缺陷可以实现引导电磁波的目的，可以制作各种各样性能优异的光子晶体光学器件。
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