ilding, I realized that I was freezing cold. When I rubbed my arms in the sunshine, a few girls next to me suddenly screamed.They pointed at the teaching building and cried out for help anxiously. I t...ǎn Chén reached out and opened the child's mouth, his other finger tapping lightly above their lips. A tiny, almost invisible speck of powder fell into the child's mouth.His fingernails concealed medi...