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》

I want to be a better writer and maybe my muse will provide the motivation.

我希望成为一名更好的作者，也许我的沉思将为我提供动力。

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There appear to be many unexplored matters about the motivation to reflect—for example, the value of externally motivated reflection as opposed to that of teachers who might reflect by habit.

反思的动机方面似乎有许多问题尚未被探索——例如，与教师可能进行的习惯性反思相对的，受外部激励的反思的价值。

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Mosee says that for the young women in her book, their children provided the motivation for them to struggle and succeed.

VOA: standard.2009.12.04

And the motivation for choosing a pair like that is easy to see, if we look at our condition for spontaneous change or general condition.

我们这样选择的动机,很明显，如果考察我们所考虑的自发变化的条件,或者更一般的条件。

麻省理工公开课 - 热力学与动力学课程节选

So I look to myself and look at the past and see it as the motivation for me to move on.

所以，我看着自己，回顾过往，把过去当做自己前进的动力。

对你而言，钱是？ - SpeakingMax英语口语达人

The motivation comes when understanding the positive impact alignment can have on revenue and profitability.

FORBES: Three Steps to Alignment

There's no way of finding the motivation for doing it unless you absolutely love the sport.

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Mitchell says the motivation can't be purely financial--neither he nor Strupp draw enormous salaries.

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