This aerial photo shows people visiting the Ice-Snow World theme park in Harbin, northeast China's Heilongjiang Province, Feb. 1, 2023. Harbin, known as China's "ice city", has been attracting many tourists in winter tourism season. (Xinhua/Xie Jianfei)

People visit the Ice-Snow World theme park in Harbin, northeast China's Heilongjiang Province, Feb. 1, 2023. Harbin, known as China's "ice city", has been attracting many tourists in winter tourism season. (Xinhua/Xie Jianfei)

This aerial photo shows people visiting the Ice-Snow World theme park in Harbin, northeast China's Heilongjiang Province, Feb. 1, 2023. Harbin, known as China's "ice city", has been attracting many tourists in winter tourism season. (Xinhua/Xie Jianfei)

This aerial photo shows people visiting the Ice-Snow World theme park in Harbin, northeast China's Heilongjiang Province, Feb. 1, 2023. Harbin, known as China's "ice city", has been attracting many tourists in winter tourism season. (Xinhua/Xie Jianfei)

People visit the Ice-Snow World theme park in Harbin, northeast China's Heilongjiang Province, Feb. 1, 2023. Harbin, known as China's "ice city", has been attracting many tourists in winter tourism season. (Xinhua/Xie Jianfei)

This aerial photo shows people visiting the Ice-Snow World theme park in Harbin, northeast China's Heilongjiang Province, Feb. 1, 2023. Harbin, known as China's "ice city", has been attracting many tourists in winter tourism season. (Xinhua/Xie Jianfei)