Air rescue drill held in Shenzhen, S China

A helicopter carrying a "patient" flies to a hospital during an air rescue drill in Shenzhen, south China's Guangdong Province, May 17, 2018. (Xinhua/Mao Siqian)

Medical staff carry a "patient" during an air rescue drill in Shenzhen, south China's Guangdong Province, May 17, 2018. (Xinhua/Mao Siqian)

A medical staff member examines a "patient" during an air rescue drill in Shenzhen, south China's Guangdong Province, May 17, 2018. (Xinhua/Mao Siqian)

A helicopter carrying a "patient" flies to a hospital during an air rescue drill in Shenzhen, south China's Guangdong Province, May 17, 2018. (Xinhua/Mao Siqian)

Medical staff carry a "patient" onto a helicopter during an air rescue drill in Shenzhen, south China's Guangdong Province, May 17, 2018. (Xinhua/Mao Siqian)