In Asia and Europe, there are nine major language families, including Sino-Tibetan, Altaic, South Island, South Asian, Dravidian, Indo-European, Caucasian, Finno-Ugric, and Afro-Asian, and research has shown that the basic words of these languages often have cross-family etymological correspondences, which are supposed to reflect the origins of the languages of the very early times, and that in fact, no language family is isolated, and no one language In fact, no language family is isolated, nor is any language. The study of language and dialect diffusion, migration, and transposition is about etymology, and etymology used to be about the history of words as they appeared in the literature. The study of etymology and etymology are simply observations from different perspectives. Further studies combining these two aspects can find out more from the historical tracing of these two aspects respectively, and propose new explanations for some long-standing issues. The Comparative Study of the Basic Words of Asian and European Languages (5 volumes) by Wu Anqi studies the comparison of the basic vocabularies of Asian and European languages from this perspective.