So let's ask, is there an optimal substructure to this problem.

所以让我们问问，这个问题是否有最优子结构。

麻省理工公开课 - 计算机科学及编程导论课程节选

There was a conditional agreement: yes, Norway should manage this oil risk but it's politically difficult and that's the problem-- is that we're not able to do our optimal management.

他们在一定程度上同意我的观点：,是的，挪威应该设法解决石油的风险,但这在政治上很困难,其问题在于-,挪威无法做到最优的管理。

耶鲁公开课 - 金融市场课程节选