Photo taken on Jan. 13, 2020 shows a poster of the Year of the Rat stamp sheet at the United Nations Postal Administration (UNPA), at the UN headquarters in New York. The United Nations Postal Administration (UNPA) has issued a special-event stamp sheet to celebrate the Chinese Lunar New Year. (Xinhua/Li Muzi)

Photo taken on Jan. 13, 2020 shows a poster of the Year of the Rat stamp sheet at the United Nations Postal Administration (UNPA), at the UN headquarters in New York. The United Nations Postal Administration (UNPA) has issued a special-event stamp sheet to celebrate the Chinese Lunar New Year. (Xinhua/Li Muzi)

Photo taken on Jan. 13, 2020 shows the Year of the Rat stamp sheet at the United Nations Postal Administration (UNPA), at the UN headquarters in New York. The United Nations Postal Administration (UNPA) has issued a special-event stamp sheet to celebrate the Chinese Lunar New Year. (Xinhua/Li Muzi)

Photo taken on Jan. 13, 2020 shows a poster of the Year of the Rat stamp sheet at the United Nations Postal Administration (UNPA), at the UN headquarters in New York. The United Nations Postal Administration (UNPA) has issued a special-event stamp sheet to celebrate the Chinese Lunar New Year. (Xinhua/Li Muzi)