Other things can also carry messages. For example, a sign at the bus stop helps you to know which bus to take. A sign on the wall of your school helps you to find the library. Do you ever notice that there are a lot of signs around you and you receive (收到) messages from them all the time? People can communicate (沟通) in many other ways. An artist can use his drawings to tell about beautiful mountains, the blue sea and many other things. Books are written to tell you about all the wonderful things in the world. Books, magazines, TVs, radios and films all help us to communicate with each other. They all help us to know what is going on in the world.
