Light is an electromagnetic wave, with a longer wavelength than X-rays and ultraviolet, and a shorter wavelength than infra-red, microwaves and radio waves.
光是一种电磁波，其波长长于X光和紫外线，短于红外线、微波和无线电波。
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Allows 70% of natural light to pass through your Windows but rejecting up to 97% of infra-red heat and 99% of harmful ultra-violet rays!