N a radio frequency between 30 000 and 300 000 megahertz (30 000～300 000兆赫的)极高频 ( abbr: EHF)
Ultrasonic devices use sound waves of extremely high frequency.
音波装置使用极高频率的声波。
The wafer is a piezoelectric resonator, expanding and contracting in response to electrical voltages at a precise, extremely high frequency.
该晶片是一个压电谐振器，以精准而极高的频率对电压作出反馈，进行放大和收缩。
The seismicity in yunnan region in the20th century occupies a front place in Chinese mainland in extremely high frequency strength and hazard rate.
20世纪云南地区地震活动以极高的频度、强度和成灾率而位居我国大陆之前列。
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