"So far,at this date and time, I have no information if we have received any formal invitation from the organizers of that Hague summit,".

VOA: standard.2009.03.19

If there's no work to be done, 0 the running time is gonna be zero.

如果并不需要做什么，那么其运行时间肯定为。

哈佛公开课 - 计算机科学课程节选