想一想，要是把时间倒转来看，发射光子的过程会变成什么样子呢？

Consider what the emission process looks like when viewed reversed in time.

youdao

但是偶尔这偶极场会转换极性——南极和北极倒转，这个过程似乎需要几千年的时间。

But occasionally this dipole field switches polarity north and south reverses, and this process seems to take a few thousand years.

youdao

推测我们会采取什么样不同的方法是容易的，但时间不会倒转。

It would be easy to speculate about what we could have done differently, but that wouldn't turn back the clock.

youdao

For if such holy Song / enwrap our fancy long," then we'll mistakenly convince ourselves that time could actually run backwards and that we've been returned to the Golden Age, the very first age of human history according to classical legend.

如果这神圣的天籁，永远包围我们想象的心怀“,然后我们就会错误的说服我们自己,时间实际上就会倒转,我们就会到达黄金般的国度，依照古典的传说就是人类最久远的历史。

耶鲁公开课 - 弥尔顿课程节选