1. You can't hear waves of such a high frequency. 你听不到这么高频率的声波。
2. The frequency of Kara's phone calls increased rapidly. 卡拉打电话的频率迅速增加。
3. Objects like this turn up at sales with surprising frequency. 这样的东西在拍卖会上出人意料地频繁出现。
4. Their instruments detected very faint radio waves at a frequency of 3 kilohertz. 他们的仪器探测到了频率为3千赫的非常微弱的无线电波。
5. Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second. 有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。
