People walk at a greenway park in north China's Tianjin, Nov. 12, 2019. The greenway park is rebuilt from an abandoned railway in Hexi District along Fuxing River. The park serves as a place for citizens to take recreation and enjoy fresh air. [Photo/Xinhua]

Photo taken on Nov. 12, 2019 shows the scenery of a greenway park in north China's Tianjin. The greenway park is rebuilt from an abandoned railway in Hexi District along Fuxing River. The park serves as a place for citizens to take recreation and enjoy fresh air. [Photo/Xinhua]

People walk at a greenway park in north China's Tianjin, Nov. 12, 2019. The greenway park is rebuilt from an abandoned railway in Hexi District along Fuxing River. The park serves as a place for citizens to take recreation and enjoy fresh air. [Photo/Xinhua]

Kids play at a greenway park in north China's Tianjin, Nov. 12, 2019. The greenway park is rebuilt from an abandoned railway in Hexi District along Fuxing River. The park serves as a place for citizens to take recreation and enjoy fresh air. [Photo/Xinhua]

Photo taken on Nov. 12, 2019 shows the scenery of a greenway park in north China's Tianjin. The greenway park is rebuilt from an abandoned railway in Hexi District along Fuxing River. The park serves as a place for citizens to take recreation and enjoy fresh air. [Photo/Xinhua]