We don't understand quantum physics enough to know if these closed timelike curves could or couldn't exist.

我们对量学的了解还不够，不知道这些封闭的时间型曲线是否存。

Without getting into too much detail, a time machine like a Tipler cylinder could create a closed timelike curve.

简单来，像提普勒柱体这样的时间机器可以创造出个封闭的时间型曲线。

In a closed timelike curve, when you travel to the past, you've always been a part of that past.

个封闭的时间型曲线中，当你回到过去，你就直是过去的部分。

They also have regions inside them where it  would be possible to travel to your own past along closed timelike curves which creates one  of those time-travel grandfather paradoxes.

它们内部还存些区域，人们可以沿着封闭的类时间曲线回到自己的过去，这就产生了时间旅行祖父悖论之。