英语翻译
People can rent one of these cars for a whole day or just take a ride in it from one place to another,the professor said.Around 400 to 500 of these cars will be made for the Expo in 2010.The cars will have radar to help them get around people and builiding.They will mainly use solar batteries and lithium batteries.As they have no needs for drivers and oil,these cars will help save energy and human labor and cause no pollution to the environment!