1. This sentence was said by French microbiologist and chemist Pasteur. The original words are that although science has no national borders, scholars have their own country;

2. 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;

3. He said: Although science has no national borders, scientists have their own motherland. These resounding words fully expressed the patriotic feelings of a scientist, and thus became an immortal patriotic saying.