If you make three people-- or even better, four people a day feel good and they make-- they pay it forward and make four others feel good, and so on and so on.

如果你能让三个人-,甚至四个人度过美妙的一天-,他们会推展，让四人有美好的一天，以此类推。

哈佛公开课 - 幸福课课程节选

After six weeks of learning about waste, water, and green spaces, trainees are expected to pay-it-forward with a project tailored to the needs of their neighborhood.

FORBES: Sustainability, By Design

Let us change ourselves and the people around us and "Pay it forward" - as in the film.

CNN: Just Imagine forum: Your views

As I understand it, the pay-fors they put forward will require a change in the caps, a reduction in the caps agreed to in the Budget Control Act.

WHITEHOUSE: Press Briefing