它们还可以辐射远红外线不同频率(区)的能源，这点是一般人做不到的。
They can also radiate far infrared ray (FIR) energy of varying frequencies, which is something ordinary people can not do.
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), a part of natural sunlight having the longest wavelength, cannot be seen with the naked eye.
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