Throughout the world more than 100 countries,only a dozen developed countries can successfully cross the middle-income trap,and into the ranks of high-income countries.Most developing countries are caught.in a middle-income trap,which is typical of Latin American countries.In 2010,China's per capita GDP is more than $4000,officially among the ranks of middle-income countries.But China across the process of themiddle-income trap is also facing many challenges,needs to learn from the experience of South Korea...