The Library of Congress has a huge collection of 128 million copies in the history of libraries. Celebrity data are recorded all over the world. A lot of American students come here to visit practical learning. It is worth mentioning that when she returned home, a friend of her mother said that she could use her passport to get a library card when she went there. The validity period was two years. She could even look up the historical records of her grandfather's early revolutionary period. Unfortunately, at that time, we did not know that we could apply for it. We did not do enough homework. Otherwise, we could hold a library card as a souvenir.