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. (Photos: Xinhua)

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.

Photo taken on Jan. 5, 2021 shows the newly issued special stamps themed on the Year of the Ox in Changchun, northeast China's Jilin Province. China Post on Tuesday issued a set of two special stamps to mark the upcoming Year of the Ox.

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.

A stamp collector holds two first day covers marking the issue of a set of special stamps themed on the Year of the Ox by China Post 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.

Artist Yao Zhonghua (R), designer of the newly issued special stamps themed on the Year of the Ox, signs a first day cover of the special stamps for a stamp collector 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.

Artist Yao Zhonghua, designer of the newly issued special stamps themed on the Year of the Ox, holds the newly issued special stamps themed on the Year of the Ox designed by him 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.

A staff member 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.

A staff member 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.

A stamp collector shows the cover of 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.

People buy the newly issued special stamps themed on the Year of the Ox at a post office 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.