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Physicists studying the issue talk not about time machines but about closed timelike curves (CTCs).
讨论这类想法的物理学家，谈的不是时光机器，而是类时迴圈（closedtimelikecurve,CTC）。
Maybe closed timelike curves aren't closed at all?
也许闭合的类时间曲线根本不是闭合的？
In a closed timelike curve, when you travel to the past, you've always been a part of that past.
在一个封闭的时间型曲线中，当你回到过去，你就一直是过去的一部分。
Without getting into too much detail, a time machine like a Tipler cylinder could create a closed timelike curve.
简单来说，像提普勒柱体这样的时间机器可以创造出一个封闭的时间型曲线。
We don't understand quantum physics enough to know if these closed timelike curves could or couldn't exist.
我们对量子物理学的了解还不够，不知道这些封闭的时间型曲线是否存在。
In mathematical physics, the causal structure of a Lorentzian manifold describes the causal relationships between points in the manifold.
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