Volunteers deliver fruit for tourists at a hotel in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Guo Cheng)

A tourist receives goods she ordered online from a delivery man outside a hotel in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Guo Cheng)

Photo taken on Aug. 7, 2022 shows inflatable COVID-19 testing labs in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Guo Cheng)

Volunteers deliver fruit for tourists at a hotel in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Guo Cheng)

Medical workers take swab samples from citizens for nucleic acid testing in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Zhao Yingquan)

Staff members work in an inflatable COVID-19 testing lab in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Guo Cheng)

A volunteer works at a nucleic acid testing site in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Zhao Yingquan)

Tourists line up to receive nucleic acid tests at a testing site in Sanya, south China's Hainan Province, Aug. 7, 2022. Prevention and control measures have been taken in Sanya to fight against the new resurgence of COVID-19 in the city. (Xinhua/Guo Cheng)