One reason for this is obvious; it's cheaper not to pay people, but the other reason is more interesting.

这样做的其中一个原因很明显;,不用付钱，当然就能省点了，但另一个原因更有意思。

耶鲁公开课 - 心理学导论课程节选

But they know that we need the transportation and that we will pay for it, so there you go.

但他们知道，我们需要交通工具，我们会为之付钱的，所以你就知道了。

纽约的交通手段 - SpeakingMax英语口语达人

But one reason why they ask for money is if you don't pay for therapy you don't think it has any value.

但他们收钱的其中一个原因是,不用付钱的心理治疗，你会觉得它没什么用。

耶鲁公开课 - 心理学导论课程节选

But then they posed a different version of the same question and the different version was: Suppose you had ordered tickets to pick them up and pay for them at the window at the concert hall and you brought $400 in cash in your pocket.

然后，他们又对同样的问题,给予了不同的假设场景：,假设你预定了两张票,你得去音乐厅的窗口,付钱然后取票,你随身带了四百美元。

耶鲁公开课 - 金融市场课程节选

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

They're already paying for public transport, so it's just kind of a financial expense they could do without.

他们已经向公共交通付钱了，所以，那只是一笔没有必要的财务支出。

公共交通更方便 - SpeakingMax英语口语达人

Sometimes they're free. Sometimes you can pay for them.

有时是免费的。有时你要付钱看。

看表演很好 - SpeakingMax英语口语达人