This clock, called a hydrogen maser, can keep time to within a billionth of a second.

这个称为氢脉泽的时钟可以将时间保持在十亿分之一秒以内。

We use GPS to timestamp it and then we use the hydrogen maser to make sure that on the shortest time scales, everything's aligned just fine.

我们用 GPS 给它打上时间戳， 然后我们用氢脉泽来确保在最短的时间尺度上，一切都很好。

At the other end of this lab is where the clock signals come in, so the hydrogen maser is in the bunker that's underneath here in its concrete shell, and it sends up its reference tone 10 megahertz signal.

在这个实验室的另一端是时钟信号输入的地方，所以氢脉泽在它下面的混凝土外壳中的掩体中，它发送它的参考音调 10 兆赫兹信号。