A photon is explained as an exciton of the electromagneticmode, and the photon has an internal motion.
把光子理解为一个电磁模的元激发，光子亦具有内部运动。
2
You can also put it on “flight” or “off-line” mode, which stops electromagnetic emissions.
晚上可以将手机关机或者调到飞行模式。
3
Whenever possible, use the speaker-phone mode or a wireless Bluetooth headset, which has less than 1/100th of the electromagnetic emission of a normal cell phone.