天文台表示在上午一时至三时间共录得4，593次闪电。

The Observatory said there were 4,593 lightning strikes between 1am and 3am.

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利用慢流形和快流形的概念，研究了电力系统三时间尺度动态模型降阶的条件。

The condition for the reduction of a three time scale power system model is studied by using the concepts of fast and slow manifolds.

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And in fact, one of the lessons you may already be realizing with P sets is that things seem to take twice, three times, four times longer than you actually might think.

从习题集中你可能已经得出的一个教训就是,程序所花的实际时间往往是你开始以为的两倍，三倍，四倍甚至更长。

哈佛公开课 - 计算机科学课程节选

We're going to talk in a minute about those three sections, so you want to have that handy.

我们将用一分钟的时间讲这三大部分，所以你们要快点找出那张讲义。

耶鲁公开课 - 旧约导论课程节选

He spent at least two-thirds of his more than, about three-quarters of his time in the northern states.

他至少花费了他旅程的三分之二,可能不止,应该是他旅程的四分之三时间,周游于北方各州

耶鲁公开课 - 美国内战与重建课程节选