The birth of language is a complicated historical process involving many different factors and stages. Below was a rough timeline: 1. Voice production: Early humans used growls, hisses, coughs, and other methods to express their opinions and thoughts. The way these voices were produced had promoted the development of human communication. 2. Symbol system: With the development of human intelligence, people began to use symbols to express their thoughts and concepts. These symbols could be words, numbers, symbols, and so on. 3. Language development: As the demand for human communication increased, people began to develop more complex symbol systems in order to better express their ideas and concepts. This development spurred the development of language. Language classification: People began to classify languages in order to better understand and use them. This classification could be grammar, vocabulary, phonology, and so on. Language revolution: As time passed, languages began to change. People began to use new languages, vocabulary, and grammar rules to express their thoughts. This change could be called a change or evolution of language. Language is a complex system. Its production and development are the result of human intelligence and cultural communication.