If you don't pay people, they are more committed to the cause.

如果你不付钱给这些人，他们就对竞选更加投入。

耶鲁公开课 - 心理学导论课程节选

And we have renters in there who are paying us,

在那里有租客，他们会付钱给我们，

金融危机 - SpeakingMax英语口语达人

We say two of these trials will come for real, so if you buy the products, you pay us, we will ship the product to you, otherwise you keep the money.

我们告知受试者试验中有两种商品是真实的，所以如果受试者想要购买的话，就可以付钱给我们，我们把商品寄送过去，否则钱就是受试者的。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

You can get so much for free, why should I pay for WSJ.com?

很多东西都免费,为什么一定要付钱给WSJ.com

耶鲁公开课 - 金融市场课程节选