他动机纯正。

His motives were pure.

《牛津词典》

我怀疑他的动机。

I'm suspicious of his motives.

《牛津词典》

我怀疑他的动机。

I was suspicious of his motives.

《牛津词典》

Now Mr. Milton took some risks when he separated himself from his cash and lent money to his clients, or lent more money to his clients than the collateral, the gold, was actually worth. And the motive for that risk, of course, the motive for that investment, was the expectation of a profit.

但是弥尔顿先生却冒着把自己和他的现金,也丢了的风险，或者借出去的钱比担保财产还要多，他这么投资的动机是，希望获得收益。

耶鲁公开课 - 弥尔顿课程节选

Consider one thinker, and I will, I'm going to read you a short passage and I'm going to come back to this again later in the semester, from Thomas Hobbes' Leviathan, chapter 31 of Leviathan, where Hobbes gives us a very personal statement about his intention in writing this book.

细想以下这一位思想家，我将朗读一小段文章,然后在学期后段,再回到这个主题来，这是取自贺伯斯的《利维坦》,第，31，章，贺伯斯提供了十分贴切的陈述,关于他撰写本书的动机。

耶鲁公开课 - 政治哲学导论课程节选

We had a good fortune to start it with a very top person in the GDMG, feeling it is a very important initiative within his organization.

我们运气很好,可以从GDMG的,一个顶尖人才开始研究，我们认为这一动机,是他的组织的原动力。

麻省理工公开课 - 媒体、教育、市场课程节选