2022 Nov 8th Zhangjiakou/Dongying, China
2021 Nov 19th Beijing, China
2021 May 26th Beijing, China
2020 Nov 30th Beijing, China
2020 June 6th Beijing, China
2020 January 11th Beijing, China
2018 July 28th Datong, China
2018 January 31th Beijing, China
2015 September 28th Murten, Switzerland
2014 October 8th Mudanjiang, China
2014 April 15th Hawaii, USA
2011 December 10th Beijing, China