英汉词典

1. 频率;发生次数
    The frequency of an event is the number of times it happens during a particular period.

    e.g. The frequency of Kara's phone calls increased rapidly...
           卡拉的电话飞速增多。
    e.g. The tanks broke down with increasing frequency.
           坦克越来越频繁地熄火。

2. (声波或无线电波的)频率，周率
    In physics, the frequency of a sound wave or a radio wave is the number of times it vibrates within a specified period of time.

    e.g. You can't hear waves of such a high frequency.
           如此高频率的声波是无法听到的。
    e.g. ...a frequency of 24 kilohertz.
           24 千赫的频率