This sentence was said by French microbiologist and chemist Pasteur. The original words are "Although science has no national borders, scholars have their own country." After the Franco-Prussian War broke out, Germany occupied French territory. Out of his deep feelings for his motherland and his great hatred for the invader Germany, Pasteur resolutely returned the honorary degree certificate to the University of Bonn. He said: "Science Although there are no national borders, scientists have their own motherland." These resounding words fully express the patriotic feelings of a scientist and have become an immortal patriotic saying.