Extremely attached to a cartoon of a mouth, Shitou, a 3-year-old boy who suffers from impaired verbal communications, shows the book to anyone he sees and asks people to say "mouth" by pointing to it. Li Yun, a 24-year-old Beijing girl who has just graduated from college, has been volunteering by teaching in Shelpherd's Field since September. [Photo by Yan Dongjie/chinadaily.com.cn]