A teacher instructs students in practicing curling at a primary school in Xingtai City, north China's Hebei Province, Nov. 24, 2020. Winter sports have been introduced to some schools in Xingtai City, aiming to make more students engage in winter sports. (Photo by Zhang Chi/Xinhua)

A teacher instructs students in practicing curling at a primary school in Xingtai City, north China's Hebei Province, Nov. 24, 2020. Winter sports have been introduced to some schools in Xingtai City, aiming to make more students engage in winter sports. (Photo by Zhang Chi/Xinhua)

Students practice speed skating under instructions of a teacher at a primary school in Xingtai City, north China's Hebei Province, Nov. 24, 2020. Winter sports have been introduced to some schools in Xingtai City, aiming to make more students engage in winter sports. (Photo by Zhang Chi/Xinhua)

Students practice speed skating at a primary school in Xingtai City, north China's Hebei Province, Nov. 24, 2020. Winter sports have been introduced to some schools in Xingtai City, aiming to make more students engage in winter sports. (Photo by Zhang Chi/Xinhua)

A teacher instructs students in practicing speed skating at a primary school in Xingtai City, north China's Hebei Province, Nov. 24, 2020. Winter sports have been introduced to some schools in Xingtai City, aiming to make more students engage in winter sports. (Photo by Zhang Chi/Xinhua)