Photo taken on July 14, 2014 shows the under-construction Sanya Haitang Bay International Shopping Mall in Sanya,China's Hainan province. According to the China Duty Free Group, the shopping mall will begin trial operation on September 1 this year. The 70,000-square-meter shopping mall project, with 5 billion yuan ($805 million) investment, will house the world's largest duty-free shop, which covers 45,000 square meters. [Photo/Xinhua]

Tourists wait in queue in front of the checkout counter to pay for commodities at a duty-free shop in Sanya, South China's Hainan province, Jan. 15, 2014. The volume of sales of free commodities sums up 3.3 billion yuan ($545.82 million) in 2013 on the offshore islands in Hainan province with the volume of customers surpassing 1.1 million. [Photo/Xinhua]

Tourists choose commodities at a duty-free shop in Sanya, South China's Hainan province, Jan. 15, 2014. The volume of sales of free commodities sums up 3.3 billion yuan ($545.82 million) in 2013 on the offshore islands in Hainan province with the volume of customers surpassing 1.1 million. [Photo/Xinhua]

Photo taken on July 14, 2014 shows the under-construction Sanya Haitang Bay International Shopping Mall in Sanya,China's Hainan province. According to the China Duty Free Group, the shopping mall will begin trial operation on September 1 this year. The 70,000-square-meter shopping mall project, with 5 billion yuan ($805 million) investment, will house the world's largest duty-free shop, which covers 45,000 square meters. [Photo/Xinhua]