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古代,人们曾经给自己心目中的神赋予了很多超人的力量,比如火眼金睛、千里眼、顺风耳等。今天,夜视仪、雷达、无线电台等设备已经使凡人具有了这些神的本领。虽然它们的工作原理不同,但都依赖于我们既陌生又熟悉的电磁波。说陌生,是因为电磁波一般看不见,摸不着,人们似乎感觉不到它的存在。说熟悉,是因为人们在日常生活中时时都离不开它:打开微波炉,利用微波将食物加热;打开电视机,接受电磁波传递来的丰富节目;掏出大哥大,通过无线电波与远方的人交谈……
In ancient times, people had given many superhuman powers to their own gods, such as fire eyes, clairvoyance, downwind ears and so on. Today, night-vision equipment, radar, radio and other equipment have enabled mortals to possess these divine skills. Although they all work in different ways, they all rely on electromagnetic waves that we are both familiar and familiar. To say strange is because the electromagnetic waves can not be seen and touched. People do not seem to feel it's existence. To be familiar is that people in their daily life can not do without it: open the microwave oven, the use of microwaves to heat the food; turn on the TV, to accept the rich program of electromagnetic transmission; pulled out the big brother, by radio waves and afar chat……