With the rapid development of technology and science,cell phones are becoming more and more commonly in people's daily life.From the diagram,it is clear to see that more and more people use cell phones.What's more,the numbers of using cell phones are growing quickly.
Many factors are responsible for this.For one thing ,the life quality has been largely improved since 1990s.As a result,people have enough money to buy these high-end products like computers,mobiles.For another thing,thanks to the fierce competition between manufacturer of cell phones,customer can gain much benefit from their activities.They can buy good phones at a low price.
Our life are getting more and more convenient and shortcut because of the popularization of cell phones.However,it is also very harmful to our health for its heavy radiation.It is essential that we should use cell phones more effectively and reasonably!