hertzian vibrator

例句：

1. 1.The frequency of the signal is measured in hertz.
   信号的频率是以赫兹为单位测量的。
2. 2.The clock has a 60-second cycle, which is equal to 60 hertz.
   这个钟有60秒的周期，等于60赫兹。
3. 3. The radio waves travel at the speed of light, which is about 299,792 kilometers per hour, or 300,000 kilometers per second, or 300 million hertz.
   无线电波以光速传播，大约每秒30万千米，或者每秒钟3亿赫兹。