大气电,自然电波由自然现象,如闪电等产生的电磁辐射等 Electromagnetic radiation produced by natural phenomena such as lightning.
无线通讯以电磁波密码进行的可听信号的联络 Communication of audible signals encoded in electromagnetic waves.
激光器使偶然的混杂频率的电磁辐射,变为一个或更多的高度强化和连续的紫外线、可见光或红外线辐射的分离频率仪器中的一种 Any of several devices that convert incident electromagnetic radiation of mixed frequencies to one or more discrete frequencies of highly amplified and coherent ultraviolet, visible, or infrared radiation.
调制器用以调制电磁波的装置 A device used to modulate an electromagnetic wave.