One that was developed a number of years ago but has been perfected and refined in recent years with very, very good research.

该概念很多年前就已经提出了,但在近年通过高水平的研究才被改进完善

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The city is natural in that it allows human beings to achieve and perfect what he calls their telos.

城市是自然的演变,它让人类可以达成,并完善他们被称为，Telos，的目标。

耶鲁公开课 - 政治哲学导论课程节选