This photo taken on December 24, 2018 shows people visiting the Harbin Ice-Snow World in Harbin, China's northeastern Heilongjiang province. The Harbin Ice and Snow Sculpture Festival will kick off in the city on January 4, 2019, which attracts hundreds of thousands of visitors annually. - China OUT / AFP / STR

People prepare a snow sculpture for the Harbin Sun Island International Snow Sculpture Art Expo in Harbin, Heilongjiang province, China December 19, 2018. REUTERS/Stringer ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. CHINA OUT.

This photo taken on December 24, 2018 shows people visiting the Harbin Ice-Snow World in Harbin, China's northeastern Heilongjiang province. The Harbin Ice and Snow Sculpture Festival will kick off in the city on January 4, 2019, which attracts hundreds of thousands of visitors annually. - China OUT / AFP / STR

The moon shines as workers prepare an ice sculpture ahead of the Harbin International Ice and Snow Sculpture Festival in Harbin, Heilongjiang province, China December 20, 2018. Picture taken December 20, 2018. REUTERS/Stringer ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. CHINA OUT.

This photo taken on December 23, 2018 shows people visiting the Harbin Ice-Snow World in Harbin, China's northeastern Heilongjiang province. The Harbin Ice and Snow Sculpture Festival will kick off in the city on January 4, 2019, which attracts hundreds of thousands of visitors annually. - China OUT / AFP / STR

This photo taken on December 23, 2018 shows people visiting the Harbin Ice-Snow World in Harbin, China's northeastern Heilongjiang province. The Harbin Ice and Snow Sculpture Festival will kick off in the city on January 4, 2019, which attracts hundreds of thousands of visitors annually. - China OUT / AFP / STR

Trucks are seen near a snow sculpture for the Harbin Sun Island International Snow Sculpture Art Expo during sunset in Harbin, Heilongjiang province, China December 24, 2018. Picture taken December 24, 2018. REUTERS/Stringer ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. CHINA OUT.

People visit illuminated ice sculptures at the Ice and Snow World park ahead of the Harbin International Ice and Snow Sculpture Festival, in Harbin, Heilongjiang province, China December 23, 2018. Picture taken December 23, 2018. REUTERS/Stringer ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. CHINA OUT.