Each satellite contains four " atomic clocks, " which vibrate at a precise frequency, according to the laws of the quantum theory.

每颗卫星都装有4个“原子钟”，它们根据量子理论法则，以精确的频率振动。

This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.

这取决于 21 厘米波长或每秒 1420 兆周的精确无线电频率。