frequency
noun uk/ˈfriː.kwən.si/ us/ˈfriː.kwən.si/
(HAPPENING)
[ C or U ]（事件发生的）频度，次数;频繁
the number of times something happens within a particular period, or the fact of something happening often or a large number or times
Complaints about the frequency of buses rose in the last year. 去年对公车发车频率的投诉增长了。
the increasing frequency of terrorist attacks 越来越频繁的恐怖袭击
It's not the duration of his absences from work so much as the frequency that worries me. 与他的旷工时日相比，他旷工的频繁程度更让我担忧。
(LIGHT/SOUND/RADIO)
[ U ] physics specialized（尤指声波或无线电波每秒振动的）频率
the number of times that a wave, especially a light, sound, or radio wave, is produced within a particular period, especially one second
the frequency of light 光的频率
low frequency radiation 低频辐射
The human ear cannot hear very high-frequency sounds. 人耳听不到极高频率的声音。
[ C ] media specialized频率（无线电信号的每秒电波数）
a particular number of radio waves produced in a second at which a radio signal is broadcast
Do you know what frequency the BBC World Service is on? 你知道英国广播公司的广播频率是多少吗？