Electromagnetic Fields and Waves 电磁场与电磁波
By the 1890s, Nikola Tesla had demonstrated that not just magnetic fields but also electromagnetic waves themselves could transmit power-and over far greater distances.
到1890年，尼古拉·特斯拉论证出电磁波本身也能传输电能，并且和磁场相比传输距离要长得多。
Mobile phones use radio waves to send and receive calls and these produce small electromagnetic fields that can be absorbed by the head and brain.
手机利用无线电波接打电话，而且这些无线电波会产生能被人脑吸收的电磁场。
Radiofrequency waves are electromagnetic fields, and unlike ionizing radiation such as X-rays or gamma rays, cannot break chemical bonds nor cause ionization in the human body.
射频波就是电磁场，但是与X射线或伽玛射线辐射等电离辐射不同的是，射频波不会打破化学键，也不会给人体造成电离辐射伤害。
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