Unlike pendulums and crystals, all cesium atoms are identical. 不同于钟摆及石英晶体的是,所有的铯原子都是一模一样的。
In some of them, the resonant frequency of cesium atoms remains amazingly stable, becoming a pseudo-pendulum capable of maintaining near nanosecond precision. 有些原子钟里,铯原子的共振频率极为稳定,功能相当于钟摆,精准度可达奈秒。