三分之一的人口被归类为贫困。

A third of the population has been ___classified as poor.

这些书按科目分类。

The books are ___classified by subject.

这些画将根据主题分类，我们的客人将有机会看到它们并与创作者交谈。

The paintings will be ___classified according to their subject and our guests will have the chance to see them and talk with the creators.