What is the motivation behind this sudden change?

这种突然转变背后的动机是什么？

《牛津词典》

What concerns me is our lack of preparation for the change.

让我担心的是我们对事态的变化缺乏准备。

《牛津词典》

We need to understand what motivates people, what it is that allows them to make a change.

我们需要了解是什么激励着人们，是什么让他们做出改变。

youdao

If one of your goals is to lose weight, you will also need to change how and what you eat.

VOA: special.2010.06.08

So what they do is, they're describing how these thermodynamic properties change, in terms of only state functions and state variables.

他们的作用是描述,随着状态函数和状态变量的变化，系统的热力性质如何变化。

麻省理工公开课 - 热力学与动力学课程节选

So if we have a negative change in energy for any reaction as it's written, what that actually means is we're giving off energy as the reaction proceeds.

如果我们像这里写的这样,在任何一个反应过后，得，到的能量变化为负值,这就意味着我们在这个过程中放出了能量。

麻省理工公开课 - 化学原理课程节选

What is more critical is what can we change to make the balance less difficult for that much larger host of women who work not for self-fulfillment, but because they have to.

CNN: Facebook's Sheryl Sandberg suddenly in crossfire

What these numbers really reflect is the change in what is being considered a computing device.

FORBES: Microsoft's Market Share Drops From 97% to 20% In Just Over A Decade

So what is that change in priorities, and are Europeans right to worry about it?

ECONOMIST: Working out the world