Zhou Xin (1st R), a librarian volunteer, introduces books to readers at Jimo Bookstore in Jimo, east China's Shandong Province, Jan. 17, 2017. Eighty primary school students have been taking part in daily affairs including books order, books registration and guidance service in Jimo Bookstore, spending a rich vacation in social practices. (Xinhua/Liang Xiaopeng)