A tourist takes photos of melting ice in the Huma section of the Heilongjiang River in northeast China's Heilongjiang Province, May 3, 2019. (Xinhua/Zhou Changping)

Photo taken on May 3, 2019 shows melting ice in the Huma section of the Heilongjiang River in northeast China's Heilongjiang Province. (Xinhua/Zhou Changping)

Photo taken on May 3, 2019 shows melting ice in the Huma section of the Heilongjiang River in northeast China's Heilongjiang Province. (Xinhua/Zhou Changping)

Tourists take photos of melting ice in the Huma section of the Heilongjiang River in northeast China's Heilongjiang Province, May 3, 2019. (Xinhua/Zhou Changping)

Photo taken on May 3, 2019 shows melting ice in the Huma section of the Heilongjiang River in northeast China's Heilongjiang Province. (Xinhua/Zhou Changping)

Photo taken on May 3, 2019 shows melting ice in the Huma section of the Heilongjiang River in northeast China's Heilongjiang Province. (Xinhua/Zhou Changping)