In ten years, the nonprofit group says its book exchanges have been set up in 85 countries.

该组织表示，十年来，他们交易已经在85个国家设立了免费小型图书馆。

It promotes free book exchanges where a couple of shelves are set up so people can contribute and borrow books.

它促进了免费的图书交换，在交换处设立了几个书架，这样人们就可以捐书和借书。