Stephen Orlins, head of the U.S. National Committee on U.S.-China Relations and also a witness of the establishment of diplomatic ties between the two countries, speaks during the 22nd Harvard China Forum (HCF) in Boston, the United States, April 12, 2019. The 22nd Harvard China Forum (HCF) kicked off here late Friday, as Chinese, U.S. scholars and business leaders discussed challenges facing China-U.S. relations while expressing their optimism about the future. (Xinhua/Yang Chenglin)