She began to explain to the students how to solve a very difficult problem.

VOA: special.2009.10.25

The problem is that the theory of the day can't explain it.

问题是当时没有理论解释这一点。

麻省理工公开课 - 固态化学导论课程节选

What Zelizer reported was that some life insurance companies surmounted this problem by changing the pitch, by telling their salespeople, don't try to explain probability theory to these people.

泽利泽发现有些寿险公司,通过改变营销思路克服了这个难题,他们告诉自己的推销员,不要试图给你的客户讲概率论

耶鲁公开课 - 金融市场课程节选