They use ytterbium or strontium – atoms that oscillate at visible light frequencies – and sync up lasers to the atomic oscillations for timekeeping.

他们使用镱或锶——以可见光频率振荡的原子——并将激光与原子振荡同步以进行计时。

Where modern atomic clocks use long-wavelength microwave radiation, the next generation of atomic clocks will measure atomic changes based on visible light frequencies, filling in even more decimal places of precision for what a second is.

现代原子钟使用长波长微波辐射，下一代原子钟将根据可见光频率测量原子变化，为一秒的精度填充更多的小数位。