During the exchange of the Sino-American joint mission, Gao Shihai's calligraphy was permanently collected by the Embassy of Burkina Faso During the exchange of the Sino-American joint mission, Gao Shihai's calligraphy was permanently collected by the Embassy of Burkina Faso During the exchange of the Sino-American joint mission, Gao Shihai's calligraphy was permanently collected by the Embassy of Burkina Faso During the exchange of the Sino-American joint mission, Gao Shihai's calligraphy was permanently collected by the Embassy of Burkina Faso During the exchange of the Sino-American joint mission, Gao Shihai's calligraphy was permanently collected by the Embassy of Burkina Faso