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，谈的不机器，而类迴（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(CTC)在外伤性脑脊液鼻漏术前定位诊断中的作用和价值。