But then having found one answer, you can add to it anything that gets killed by the act of taking derivatives.

一旦你算出了一个答案,你就可以往式子里加入任何,在求完导后消失的项

耶鲁公开课 - 基础物理课程节选

Every society no matter of what kind requires a kind of faith in its ruling principles in its fundamental beliefs. But belief seems to be threatened from at least two sources.

每一个社会，无论其型态为何,都需要在其统治原则及基本信念中,加入些信仰，但是信念,似乎受到至少两项来源的威胁。

耶鲁公开课 - 政治哲学导论课程节选