The difficulty of this course consists in the fact

这门课程的难度就在于
that it teaches what you already know.

传授的都是你们已有的知识
It works by taking what we know from familiar unquestioned settings

它将我们所熟知的毋庸置疑的事物
and making it strange.

变得陌生
That's how those examples worked,

正如我们刚举的例子
the hypotheticals with which we began with their mix of playfulness and sobriety.

那些严肃而又不乏趣味的假设性问题
It's also how these philosophical books work.

这些哲学类著作亦然
Philosophy estranges us from the familiar,

哲学让我们对熟知事物感到陌生
not by supplying new information

不是通过提供新的信息
but by inviting and provoking a new way of seeing

而是通过引导并激发我们用全新方式看问题
but, and here's the risk,

但这正是风险所在
once the familiar turns strange,

一旦所熟知的事物变得陌生