Staff of a shop drain the floodwater in Haikou, south China's Hainan Province, Aug. 10, 2018. Hainan was hit by heavy rainfalls under the influence of a tropical depression on Friday, which triggered a red alert for rainstorms in seven cities and counties, including Haikou. (Photo: Xinhua)

Bikes are swept down by the flood in Haikou, south China's Hainan Province, Aug. 10, 2018. Hainan was hit by heavy rainfalls under the influence of a tropical depression on Friday, which triggered a red alert for rainstorms in seven cities and counties, including Haikou. (Photo: Xinhua)

Cars run through the floodwater in Haikou, south China's Hainan Province, Aug. 10, 2018. Hainan was hit by heavy rainfalls under the influence of a tropical depression on Friday, which triggered a red alert for rainstorms in seven cities and counties, including Haikou.(Photo: Xinhua)

Staff of a shop drain the floodwater in Haikou, south China's Hainan Province, Aug. 10, 2018. Hainan was hit by heavy rainfalls under the influence of a tropical depression on Friday, which triggered a red alert for rainstorms in seven cities and counties, including Haikou. (Photo: Xinhua)

A staff of a shop carries a sand bag to keep away flood water in Haikou, south China's Hainan Province, Aug. 10, 2018. Hainan was hit by heavy rainfalls under the influence of a tropical depression on Friday, which triggered a red alert for rainstorms in seven cities and counties, including Haikou.(Photo: Xinhua)