has enjoyed more and more popularity with a booming increase to approximately 3 million food trucks and more than 5 million food cartsin the U.S. Mobile food carts are very commonly seen in malls, train and bus stations, airports, stadiums, conference centers and other locations in recent years. Street food culture has rapaidly spread to worldwide corners. Not only in advanced countries, but also in some developing countries, street food snacks are also very popular. This is a good oppotunity t