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　　Nowadays many new and useful inventions have come into use．If I were a scientist, I would have my own invention　a magic door, which can take me to every part of the world, just like Doraemon's magic door．

　　Since our life is getting busier and busier, my magic door is really needed．The population of the world is rising day by day, and the number of cars is getting larger．Therefore, traffic becomes a big problem to people in both poor and developed countries．Moreover, by using a large number of ears, people have to face another problem the pollution of the air．All those reasons lead to the need for such an invention a magic door．

　　Magic doors have many advantages．Firstly, you can go wherever you want in a minute．Just open the door and go through it, and you can stand in another place．Secondly, magic doors sometimes can even make people safe．Magic doors can be used in everyday life．For example, if you fall in the river, it can help you go out of the river．

　　All in all, people can get many good things from magic doors．The magic door would be a big change in our life!