I think first off, you got to split what people call literature from or fine literature or something like this from like commercial literature.

首先，我要将人们所称文学或纯文学与商业文学区分开来。

Our critical judgment in the case of expository books concerns their truth, whereas in criticizing belles-lettres, as the word itself suggests, we consider chiefly their beauty.

我们对说明性书籍批判性判断关是它们真实性，而在批评纯文学时，正如这个词本身所暗示那样，我们主要考虑它们。

Do Main Street and The Grapes of Wrath belong in the category of belles-lettres or are both of them sociological studies, the one concentrating on urban experiences, the other on agrarian life?

《大街》和《愤怒葡萄》到底属于纯文学范畴，还是都属于社会学研究，一个关城市经验，一个关农村生活？