90 China total 58 million 20% population is children are left in the countyside with relatives migrant + 260 million Chinese migrant lives as 77行 19 million SECOND CLASS CITIZENS children move to the city with their parents in their adopted cities source:http://www.telegraph.co.uk/news/wondnews/as//8/PiSA education tests Why Shanghar pupils are so special.html 中国概论