Students left-behind by their parents who leave home to work write blessing words on a big greeting card in Huanfeng No 3 Primary School in Hanshan county, Ma'anshan city, East 皇冠体育app's Anhui province, Dec 26, 2011. [Photo/CFP]

Students left-behind by their parents who leave home to work show their greeting cards with blessing words to their parents in Huanfeng No 3 Primary School in Hanshan county, Ma'anshan city, east 皇冠体育app's Anhui province, Dec 26, 2011. The cards will be pasted onto a larger one. [Photo/CFP]