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"Contrary to our hypothesis, young adults with high (social media use) seem to be more, and not less, socially isolated," the researchers said in a study published in July in the American Journal of Preventive Medicine.

"China's cross-border e-commerce is thriving, which brings about huge opportunities for Chinese enterprises. But, it also brings about new issues and challenges. By leveraging Amazon's global network and resources, we could provide customized solutions to meet the needs of Chinese sellers and cultivate cross-border e-commerce talent in China," Dai Jingfei, vice-president of Amazon China, said.

"Currently, Chinese students attend online classes at home, and those with weak self-control are more likely to indulge in mobile phones and the internet," said Tang Zhisong, a professor with China's Southwest University.

"Chinese smartphones are beautiful, bold and dirt cheap, according to an article on CNN's website. "They typically cost just a couple hundred bucks without a contract, and they offer some unique features American phones don't have."

"China's economy is still in a tug-of-war between headwinds and policy easing," said Lu. The central bank has suggested balancing policy easing with the need to control financial risks, given the rapid rise of debt and volatile stock markets.