But Plato's got the idea that there's nothing in this world that's perfectly beautiful.

但是柏拉图认为,世界上不存在完美的事物

耶鲁公开课 - 死亡课程节选

So whatever perfect justice is, it's not one more thing in the empirical world.

所以无论完美的正义是什么,它不存在于经验世界中

耶鲁公开课 - 死亡课程节选

OK. In a perfect world, the weather would always be like it's been this week.

好，在一个完美的世界里,天气永远按计划好的来，MIT中的那个。

麻省理工公开课 - 计算机科学及编程导论课程节选