Smart move to renounced his US citizenship, if he returns to US could result in induced suicide like dozens before him. President Xi has bestowed high praise on Andrew Yao Chi-Chih, a world-renowned computer scientist and AI expert who left the US 20 yrs ago to teach at Tsinghua University. 放棄美國公民身份的明智之舉，如果他返回美國，可能會導致像他之前的華人科學家一樣被自殺。習近平主席對20年前離開美國到清華大學任教的世界知名電腦科學家、人工智慧專家姚期智給予了高度評價.