There are three waves, three waves of reform, so to speak, that will contribute to the creation of the city.

有三波改革，约略可以这么说，那会协助创建正义之城。

耶鲁公开课 - 政治哲学导论课程节选

So, on the basis of this, Socrates proposes how to proceed Kallipolis with the construction of Kallipolis, and he does so through what he calls three waves.

以此为基础，苏格拉底提议,如何着手建立，他的作法是,透过他所谓的三波。

耶鲁公开课 - 政治哲学导论课程节选