Far Infrared Rays (FIR), a part of natural sunlight having the longest wavelength, cannot be seen with the naked eye.
远红外线(区)，自然有阳光的波长最长的一部分，不能用肉眼看到。
Far Infrared Rays (FIR) are well beyond the ability the naked eye to see.
远（区）红外线的能力远远超出肉眼看到的。
Far Infrared Rays (FIR) are well beyond the ability the naked eye to see.
远（区）红外线的能力远远超出肉眼看到的。
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