When we did the spring, we had this theory of Hooke's Law that told us something, and we built a simulation, or built some tools around that theory.

当我们写弹簧程序的时候,我们有胡克定律来告诉我们原理，然后我们建立了一个仿真模型，或者说是在这个理论基础上建立了一些工具。

麻省理工公开课 - 计算机科学及编程导论课程节选

He extended it and developed it into a theory of psychosexual development.

他在此基础上扩展并提出了,性心理发展理论。

耶鲁公开课 - 心理学导论课程节选