一种方式是观察数值随时间的变化和趋势。

One is to look at how a particular value changes over time and spot trends.

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图2显示了使用中的堆存储量随时间的变化。

Figure 2 shows the amount of heap storage that is in use over time.

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科学家们通过研究那些超新星去测量宇宙膨胀随时间的变化。

They were using these supernovae to measure how the universe's expansion is changing with time.

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But luckily for us, there's a classical equation of motion that will, in fact, describe how the electron and nucleus change position or change their radius as a function of time.

但幸运的是，有一个,经典方程描述了电子和核子,位置或者它们直接的距离是,如何随时间变化的。

麻省理工公开课 - 化学原理课程节选

So your tastes in music evolve over thousands of years.

你对音乐的品味随时间发生变化。

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So, we can use Coulomb's force law to think and it does that, it tells us the force is a function of that distance. But what it does not tell us, which if we're trying to describe an atom we really want to know, is what happens to the distance as time passes?

来考虑这两个粒子之间的,它告诉我们力随距离的函数关系,但它不能告诉我们，而我们如果要描述,原子又非常想知道的是,距离随时间的变化时怎样的？

麻省理工公开课 - 化学原理课程节选