Exploring this argument, Glaucon breaks all good things into three classes.

为了探索这个论点，格劳孔将所有美好的事物分为三类。

Glaucon tells this story to illustrate how people can apparently benefit by acting unjustly.

格劳孔讲这个故事是为了说明人们如何通过不公正的行为明显受益。

Glaucon argues that justice belongs to the second class of good: it's a burden that nevertheless brings rewards.

格劳孔认为正义属于第二类善：它是一种带来回报的负担。

At the end of this extraordinary line of reasoning, Socrates brings Glaucon to the final and definitive exclusion of tragedy from the just city.

在这一非同寻常的推理过程的最后，苏格拉底将格劳孔带到了正义之城中最终明确地将悲剧排除在外。

Socrates' final advice to Glaucon is that if we are persuaded by the myth of Er, then we shall make a good crossing of the river of Lethe and not defile our soul.

苏格拉底对格劳孔的最后忠告是， 如果我们被厄尔的神话所说服，那么我们就应该好好渡过忘川河， 而不是玷污我们的灵魂。