"Science has no borders, scientists have the motherland" is a famous saying of French scientist Pasteur, which was well interpreted by Qian Sanqiang and his son.

On the eve of the founding of New China, Mr. and Mrs. Qian Sanqiang decided to return to the motherland and devote their whole lives to what they had learned. Before leaving, someone asked Qian Sanqiang, why did you choose to return to poor China instead of a good research environment and superior living conditions? Qian Sanqiang replied: "Although science has no national boundaries, scientists have their motherland. It is precisely because the motherland is poor and backward that scientists need to work hard to change her face. "