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

1.讨论这类想法的物理学家，谈的不是器，而是类迴（closedtimelikecurve,CTC）。

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

2.摘要目的探讨CT影(CTC)在外伤性脊液鼻漏术前定位诊断中的作用和价值。