A good business plan,he says, must define a problem that the new business will solve.

VOA: special.2009.06.26

Define the path. Get all of these really clear, and you've basically solved the problem.

把所有这些搞清楚，你就基本上解决这个问题了。

麻省理工公开课 - 热力学与动力学课程节选

The problem it solves for the cell is how to do I make a barrier around myself to define what's in me and what's outside of me when most of what's around me and what's in me is water.

它为细胞解决的问题是,当我体外和体内大部分都是水情况下,我怎样在自己周围设置一个界线,来区分什么是体内的,什么是体外的

耶鲁公开课 - 生物医学工程探索课程节选