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        Theoretical research shows that under the condition of the same amplitude, the energy of an object vibrating is proportional to the vibration frequency. In the dry winter in northern my country, if the ultrasonic wave is passed into the water tank, the violent vibration will break the water in the tank into many small mist droplets, and then use a small fan to blow the mist droplets into the room, which can increase the indoor air humidity. It is the principle of the ultrasonic cleaning machine humidifier. For pharyngitis, bronchitis and other diseases, it is difficult for drugs to blood flow to the affected part. Using the principle of the humidifier, the drug liquid is atomized and inhaled by the patient, which can improve the curative effect. Using ultrasonic waves The huge energy can also make the stones in the human body vibrate violently and shatter, thereby alleviating the pain and achieving the purpose of healing.