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"Currently there is no medicine that can effectively prevent or cure cataract," Cui Hongping, director of ophthalmology of the East Hospital affiliated to Shanghai Tongji University, told thepaper.cn. He said all eye drops and oral medicine available in the market, including Shapuaisi, are not effective to treat cataract.

"ChinaSF is a leading example for international economic development in the United States," said San Francisco Mayor Mark Farrell, adding the city welcomes business from China.

"Chinese economy remained an important growth engine for the world's economic recovery," NBS chief statistician Sheng Laiyun said.

"Connectivity will represent a big portion of our growth over the next several years," he said.

"China's pursuit of dual-cycle development has actually posed higher requirements for opening-up," said Shen Jianguang, vice-president and chief economist at JD Digits. "China's vast domestic market should be better utilized to further open up the economy and attract investment," he said.