It relies on microwaves to image objects.Microwaves are a form of electromagnetic radiation(电磁辐射)-types of energy that travel through space as a wave.Electromagnetic radiation includes visible (可见的) light,which can be seen with the naked eye.It also includes several types of energy,such ...
It was truly a spectator event. Amongst the crowd of thousands, there were camp chairs, tents, fire pits, beer coolers, snow machines, hockey games (it all took place on a lake), sleds, and everything and anything else you could want for a winter celebration. As I watched the teams p...
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