Customers visit Global Premium Duty Free Plaza in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit a duty-free shop in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit Global Premium Duty Free Plaza in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit Global Premium Duty Free Plaza in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit a duty-free shop in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit a duty-free shop in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit a duty-free shop in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit a duty-free shop in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]

Customers visit Global Premium Duty Free Plaza in Haikou, south China's Hainan Province, Jan. 31, 2021. Two new offshore duty-free shops opened on Sunday in Haikou, capital of south China's island province of Hainan, raising the number of duty-free shops in the province to nine. [Photo/Xinhua]