frequency

n.

1. (某事发生可重复的)频率
   • Fatal accidents have decreased in frequency over recent years.
     近年来死亡事故发生的频率已经下降。
2. 经常发生, 频繁
   • Accidents are happening with increasing frequency.
     事故发生得越来越频繁。
3. (声波或无线电波的)振动频率; 波段
   • If we can know their frequency we will monitor their talking.
     如果我们知道他们的频率, 我们就能监听他们的谈话。