Ordinary people should learn from Mr. Yang's keen insight into the current situation: In the 1950s, Mr. Yang judged that he could not return to China; in the 1970s, he judged that he could return but not stay long; in the 2000s, he judged that he could return and stay long-term, but must retain his U.S. citizenship; finally, in 2015, the last year of the golden era of globalization, he chose to return to China and change his nationality.