Aerial photo taken on Jan. 9, 2021 shows a border policeman patrolling on the frozen Heilongjiang River near Luoguhe Village of Mohe City, northeast China's Heilongjiang Province. Mohe, the northernmost city of China, has an annual ice and snow period of up to eight months. People of different professions stick to their posts here despite harsh winter weather. (Xinhua/Xie Jianfei)
