This sentence was said by French microbiologist and chemist Pasteur. The original words are "Although science has no national boundaries, scholars have their own countries". Pasteur was an outstanding scientist in France in the19th century and the founder of microbiology. Because he invented the method of vaccination against infectious diseases, he made great contributions to the disease prevention and control of human beings and livestock and poultry raised by human beings. Due to outstanding achievements in science. He enjoys a high reputation throughout Europe, and the University of Bonn in Germany solemnly awarded the honorary degree certificate to this famous scholar. However, after the Franco-Prussian War broke out, Germany occupied French territory. Out of deep affection for the motherland and deep hatred for the aggressor Germany, Pasteur resolutely returned the honorary degree certificate to Bonn University. He said: "Although science has no national boundaries, scientists have their own motherland." Hit the floor's words fully expressed a scientist's patriotic feelings, and thus became an immortal patriotic quote.

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