Physicists studying the issue talk not about time machines but about closed timelike curves (CTCs).

讨论这法的物理学家，谈的不是时光机器，而是时迴（closedtimelikecurve,CTC）。

Objective To evaluate the value of CT cisternography (CTC) in the localization of traumatic cerebrospinal fluid rhinorrhea.

摘要目的探讨CT脑池造影(CTC)在外伤性脑脊液鼻定位诊断中的作用和价值。