非线性系统在不同力幅的正弦激励时，其频率响应函数将随力幅而变化。

When a series of different levels of sine excitation force is imposed on a non linear testing structure, the response data vary with the force.

youdao

无论什么时候你开始忧愁，立即将注意力转移到你现在马上就能够做的事情上。如果无事可做的话，就随它去吧。

Whenever you start worrying, instantly shift your focus to what you can do about the problem right now. If there's nothing to do, let it go.

youdao

您的主要目标是创建提高生产力的复合应用程序，但是我们都知道，应用程序不是静态的，并且必须总是随业务需求的变更而变化。

Creating a composite application that increases productivity is your primary goal, but we all know that applications are not static and must always adapt to the changing needs of business.

youdao

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