Looking back at history, linguists adopted analogy in the process of deciphering ancient hieroglyphics-that is, comparing the similarities between hieroglyphics and other languages. For example, the deciphering of hieroglyphics in ancient Egypt was attributed to the discovery of Cerro Saitong by Napoleon's army during their expedition to Egypt. Because there are three different languages (including ancient Egyptian hieroglyphics) engraved on the stone tablet, each language expresses the same information. By comparing the ancient Egyptian hieroglyphics on stone tablets with two other known languages, linguists have successfully solved the mystery of ancient Egyptian hieroglyphics.
However, even if the information from aliens is really obtained, human beings can't expect aliens to prepare two sets of characters (one is the language of aliens and the other is the language of earthlings); In addition, although humans may be able to understand some basic contents about mathematics and astronomy, once aliens begin to explain their history, I'm afraid humans can't understand a word.
Scientists at SETI said that the key to deciphering extraterrestrial information in the future is to fully broaden our thinking and imagine all the situations that have not been considered, even if some assumptions contradict the achievements that have been made. Scientists plan to draft some samples of human language information-not to be sent to aliens, but to learn more about the process of encoding and decoding information so as to communicate with aliens in the future.