Customers visit the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

A customer prepares to pay at the checkout counter in the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

A staff member takes the body temperature of a customer at the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

A customer visits the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

A saleswoman works in the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

Customers queue to enter the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

A saleswoman works in the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

A customer visits the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

A customer pays her bill in the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)

Customers visit the duty-free shop in Haikou, south China's Hainan province, Feb. 20, 2020. Two offshore duty-free shops resumed operation Thursday in south China's island province of Hainan amid the novel coronavirus outbreak. One duty-free shop in Haikou, capital of Hainan, runs from 10 a.m. to 6 p.m. All the sales staff are required to wear masks and gloves. Customers' temperature will be taken and masks will be checked at each entrance of the store. (Photo by Pu Xiaoxu/Xinhua)