The number of students from China studying at universities across the United States has increased dramatically. According to some statistics, the number of undergraduate students from China in the U.S. has doubled in the last two years. Economists say the trend is due, in large part, to a growing middle class in China. VOA's Elizabeth Lee reports from Los Angeles county, with one of the largest Chinese student populations in the U.S. - totaling more than 4000 students.