When you can help someone new in town solve a problem, you feel good about it.

VOA: special.2010.07.16

and how using your knowledge of math can help you solve something in biology.

如何用数学方面的知识解决生物方面的问题。

与教授的面谈 - SpeakingMax英语口语达人

What was the biggest domestic policy issue you help President Bush solve?

您帮布什总统解决的,最大的国内政策问题是什么？

普林斯顿公开课 - 国际座谈会课程节选