In this aerial photo, apricot trees in full bloom are seen in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

In this aerial photo, apricot trees in full bloom are seen in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

In this aerial photo, apricot trees in full bloom are seen in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

In this aerial photo, apricot trees in full bloom are seen in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

Apricot trees in full bloom are seen in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

In this aerial photo, apricot trees in full bloom are seen in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

People walk and take photos under flowering apricot trees in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

A girl dressed in traditional Chinese clothes poses for a photo in front of apricot flowers in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

Apricot trees in full bloom are seen in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

People walk and take photos under flowering apricot trees in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)

A girl is seen amid apricot flowers in Harbin Engineering University in Harbin, northeast China's Heilongjiang Province, April 24, 2019. (Xinhua/Wang Song)