Terahertz waves have unique properties not found in microwave and infrared radiation. Terahertz waves have “unique skills” such as high frequency, short wavelength, and low transmission loss in dense smoke, sand and other environments. You can “see through” the wall at a glance and then Scanning the interior of a house is an ideal technique for imaging enemy hunting in a complex battlefield environment. Although terahertz waves are susceptible to various climatic conditions and the transmission distance is limited when transmitting in the atmosphere, in some special cases, this " The "short board" has just become another technical "specialty" for terahertz communication. For example, when encountering atmospheric attenuation, the terahertz wave signal cannot be transmitted to the enemy's radio monitoring mechanism, so it can achieve covert short-range communication. The text does not mention terahertz waves:. ['Physical properties.', 'Special advantages.', 'Application scenarios.', 'Discovery process.']