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frequency
/ˈfri:kwənsi ||; ˈfrikwənsɪ/noun
(plural frequencies)
1 [U] the number of times sth happens in a particular period 频率（在特定时间内某种事情发生的次数）:
Fatal accidents have decreased in frequency in recent years. 近几年死亡事故发生的频率已经下降。
2 [U] the fact that sth happens often 频繁:
The frequency of child deaths from cancer near the nuclear power station is being investigated. 在核电厂附近地区，经常有儿童死于癌症，有关当局对这个现象正在进行调查。
3 [C,U] the rate at which a sound wave or radio wave moves up and down (vibrates) 频率（声波或无线电波振动的次数）:
high-frequency/low-frequency sounds 高╱低频声
☞picture at wavelength 见wavelength插图
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