Chinese visit Yale University in the United States. [Photo by JIN YAN/FOR CHINA DAILY]

J. Fraser Stoddart, one of the winners of the 2016 Nobel Prize in Chemistry, is congratulated by student Yuan Liu at Northwestern University in the Chicago suburb of Evanston, Illinois. [Photo by JIM YOUNG/REUTERS]

Yale campus. [Photo/China Daily]

Graduation ceremony at Yale University in 2014. [Photo by WANG LEI/XINHUA]

Visa applicants outside the US Embassy in Beijing. [Photo by DAMIR SAGOLJ/REUTERS]