It has units of time, it represents the price of time, and it is something that fluctuates through time in interesting patterns.

这是一种时间的单位,代表着时间价值,利率以它特殊的模式,随着时间上下摆动

耶鲁公开课 - 金融市场课程节选

And later in the semester we will tease apart just a little bit what these patterns are and why they do what they do.

过一段时间，我们会知晓它们的模式是什么,为什么它们这么做，它们都做了哪些事情。

哈佛公开课 - 计算机科学课程节选

And then in the intervening periods, they are on distant learning modules that the students complete.

其余时间，学生通过远程学习模式完成。

哈佛公开课 - 幸福课课程节选