Artificial intelligence has many sub-topics, including machine vision, language reasoning under uncertain conditions, machine hearing and so on. Many times, there will be similar choices or fill-in-the-blank questions in the theoretical examination of artificial intelligence major.

Language is the essential feature that distinguishes human beings from other animals. Of all living things, only human beings have language ability. Much of human intelligence is closely related to language. Human logical thinking exists in the form of language, and most of human knowledge is recorded and handed down in the form of language. So it is also an important and even core part of artificial intelligence.

Natural language processing is an important direction in the field of computer science and artificial intelligence. It studies all kinds of theories and methods to realize effective communication between people and computers with natural language, and it is a science integrating linguistics, computer science and mathematics.