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
光机器，而类迴圈（closedtimelikecurve,CTC）。
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，谈的光机器，而类迴圈（closedtimelikecurve,CTC）。
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