On the bus, two people were having a lively conversation, but the onlookers couldn't hear a word. Why?

Because the two people talking are mute, the two people are communicating in sign language.

Sign language uses gestures to compare movements and simulate images or syllables to form certain meanings or words based on the changes in gestures. It is a form of hand language for people with hearing impairment or speechlessness to communicate with each other and exchange ideas. Language, it is "an important auxiliary tool for spoken language" and for people with hearing impairment, it is the main communication tool.

The value of sign language

Learning sign language is not only convenient for communicating with the deaf and mute, but can also be used in ordinary people, such as noisy factories, public places, etc. Sign language is very convenient for communication. The elderly in the sign language workshop said that the older they get, the worse their hearing becomes, so they want to learn sign language in time to teach their families and facilitate communication.

People from all walks of life can use sign language, and people who cannot speak can also use sign language to express themselves. Of course, they can also write, but writing is relatively limited, relatives of the deaf-mute said. Learning sign language can reduce misunderstandings and enhance emotions. For example: After a dentist learned sign language, deaf people spread the word that all patients came to his clinic, his business flourished, and there were countless other benefits.