People park vehicles on an overpass in Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021. Photo: Xinhua

Photo taken on Aug. 21, 2021 shows sandbags stacked at the entrance of an underground passway in Zhengzhou, capital of central China's Henan Province. Photo: Xinhua

Photo taken on Aug. 22, 2021 shows sandbags stacked at the entrance of a shop in Zhengzhou, capital of central China's Henan Province. Photo: Xinhua

People park vehicles on Jinshui Road in Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021.Photo: Xinhua

Photo taken on Aug. 21, 2021 shows a flood retaining board at the entrance of a subway station in Zhengzhou, capital of central China's Henan Province.Photo: Xinhua

A man stacks sandbags at the entrance of an underground garage in Jinshui District of Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021.Photo: Xinhua

Aerial photo taken on Aug. 22, 2021 shows people parking vehicles on an overpass in Zhengzhou, capital of central China's Henan Province. Photo: Xinhua

Aerial photo taken on Aug. 22, 2021 shows people parking vehicles on an overpass in Zhengzhou, capital of central China's Henan Province. Photo: Xinhua

Staff members work at the entrance of a tunnel in Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021. Photo: Xinhua

Aerial photo taken on Aug. 22, 2021 shows people parking vehicles on an overpass in Zhengzhou, capital of central China's Henan Province. Photo: Xinhua

A staff member works at the entrance of a tunnel in Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021. Photo: Xinhua

People park vehicles on Jinshui Road in Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021. Photo: Xinhua

Staff members are on duty near a railway culvert in Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021. Photo: Xinhua

An ambulance stands by at an overpass in Zhengzhou, capital of central China's Henan Province, Aug. 22, 2021. Photo: Xinhua