A stamp collector shows the newly issued special stamps themed on the Year of the Ox in Changchun, northeast China's Jilin Province, Jan. 5, 2021. China Post on Tuesday issued a set of two special stamps to mark the upcoming Year of the Ox. (Xinhua/Zhang Nan)

Stamp collectors buy the newly issued special stamps themed on the Year of the Ox in Changchun, northeast China's Jilin Province, Jan. 5, 2021. China Post on Tuesday issued a set of two special stamps to mark the upcoming Year of the Ox. (Xinhua/Zhang Nan)

A staff member shows the newly issued special stamps themed on the Year of the Ox in Guiyang, southwest China's Guizhou Province, Jan. 5, 2021. China Post on Tuesday issued a set of two special stamps to mark the upcoming Year of the Ox. (Xinhua/Tao Liang)

Artist Yao Zhonghua (L) and Liu Aili, chairman of China Post Group Co., Ltd., attend the issue ceremony of a set of special stamps themed on the Year of the Ox, designed by Yao, in Beijing, capital of China, Jan. 5, 2021. China Post on Tuesday issued a set of two special stamps to mark the upcoming Year of the Ox. (Xinhua/Li He)