In transmitting antennas it is best to have the natural wavelength slightly above desirable wavelength.
在发射天线上，最好使固有波长略大于所要求的波长。
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。
It is used in routing switch wavelength choice optical cross connection natural repair protection and so on.
光开关可实现在全光层的路由选择、波长选择、光交叉连接以及自愈保护等功能。
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