People of the Orogen ethnic group in traditional attires attend a sacrifice ceremony to celebrate the Heilongjiang River being navigable again in Huma County, Northeast China's Heilongjiang Province, April 28, 2015. Ice crusts the Heilongjiang River for a long winter every year as the river locates in the far north of China. (Xinhua/Wang Kai)

Guan Kouni, a 80-year-old shaman of the Orogen ethnic group, performs a ritual during a sacrifice ceremony to celebrate the Heilongjiang River being navigable again in Huma County, Northeast China's Heilongjiang Province, April 28, 2015. Ice crusts the Heilongjiang River for a long winter every year as the river locates in the far north of China. (Xinhua/Wang Kai)

People of the Orogen ethnic group in traditional attires attend a sacrifice ceremony to celebrate the Heilongjiang River being navigable again in Huma County, Northeast China's Heilongjiang Province, April 28, 2015. Ice crusts the Heilongjiang River for a long winter every year as the river locates in the far north of China. (Xinhua/Wang Kai)

People of the Orogen ethnic group in traditional attires cook by riverside during a sacrifice ceremony to celebrate the Heilongjiang River being navigable again in Huma County, Northeast China's Heilongjiang Province, April 28, 2015. Ice crusts the Heilongjiang River for a long winter every year as the river locates in the far north of China. (Xinhua/Wang Kai)

A woman of Orogen ethnic group in traditional attire attends a sacrifice ceremony to celebrate the Heilongjiang River being navigable again in Huma County, Northeast China's Heilongjiang Province, April 28, 2015. Ice crusts the Heilongjiang River for a long winter every year as the river locates in the far north of China. (Xinhua/Wang Kai)

People of the Orogen ethnic group in traditional attires attend a sacrifice ceremony to celebrate the Heilongjiang River being navigable again in Huma County, Northeast China's Heilongjiang Province, April 28, 2015. Ice crusts the Heilongjiang River for a long winter every year as the river locates in the far north of China. (Xinhua/Wang Kai)

People of Orogen ethnic group put ice blocks, symbol of good business, on a sacrifice pile to celebrate the Heilongjiang River being navigable again during a sacrifice ceremony in Huma County, Northeast China's Heilongjiang Province, April 28, 2015. Ice crusts the Heilongjiang River for a long winter every year as the river locates in the far north of China. (Xinhua/Wang Kai)