In 923, the preparatory conference for the unified national language decided to adopt the Beijing phonetic standard, which was implemented throughout the country. Languages and dialects are not only communication tools, but also cultural carriers. Now, the shrinking of dialects is the fading of one culture. Coexistence is conducive to maintaining cultural diversity, and at the same time as promoting Mandarin, it should also allow dialects to have a certain expression space. Moreover, dialects not only apply to one land, but also enrich the color of common languages, such as Cantonese, pay, Words such as Lanweilou have entered the common vocabulary and have developed. What's the point of this text? ['Promoting bilingualism is conducive to maintaining traditional and local cultural characteristics.', 'b. Common language recognition is conducive to improving the cultural level and technological development of the whole nation.', 'Promote bilingualism, dialects, national languages and common languages.', 'Any common language is based on some dialect.']