Describe one of the most important inventions in the last 100 years.

　　Well, I want to talk about mobile phones.When I was a little boy, I had been dreaming of calling my friends at any time, wherever they were.Now, with the help of mobile phones, my dream has come true. Communications have become more convenient which helps us to keep frequent contacts with our families and friends. Mobile phones have brought us closer and have made the world smaller.

　　Nowadays we have got many things to cope with immediately wherever we are. If something happens, you have to be informed at the first time or you may lose business opportunities. Many other emergencies such as crime incident reports also need immediate communications. In these circumstances mobile phones are indispensable.In a word, mobile phones have made our life more convenient and more efficient.