This photo taken on April 20, 2019 shows tourists selecting products at a duty-free shop in Bo'ao, south China's Hainan Province. Since introducing relevant policies 12 years ago, south China's island province of Hainan has recorded total offshore duty-free sales of 202.4 billion yuan (about 28.19 billion U.S. dollars), according to local authorities. (Xinhua/Yang Guanyu)