and you will discuss it in your sections, no doubt.

而且你们需要对其进行讨论无疑地
The guiding thread of the book is the correspondence,

本书的线索是相似之处
the symmetry between the parts of the city and the parts of the soul.

是城市部分和灵魂部分的对称性
Discord within the city, just as discord within the soul,

城市中的不和谐正如灵魂中的不和谐
is regarded as the greatest evil.

被当作是最大的邪恶
The aim of the Republic is to establish a harmonious city,

《理想国》的目标是建立一个和谐城市
based on a conception of justice that,

在正义这个概念的基础上
so to speak, harmonizes the individual and society,

可以说是使个体与社会和谐
how to achieve that.

如何达到这个目标
The best city would necessarily be one

最好的城市必然会
that seeks to produce the best or highest type of individual.

寻求去产生最好的和最高类型的个体
Plato's famous answer to this is that

柏拉图对这一问题的著名回答是