Today we have more and more cars.Cars becomes more and more important in our daily life.Are cars advantage or disadvantage to us?On one hand,using them can save time and it is very convenient .But sitting in the cars too long is not good for people's health.What is worse,the waste gas from the cars pollute our environment seriously.It effects not only ourselves but also our next generation.So I think we shouldn't have more cars in the future. Today we have more and more cars.Cars becomes more and more important in our daily life.Are cars advantage or disadvantage to us?On one hand,using them can save time and it is very convenient .But sitting in the cars too long is not good for people's health.What is worse,the waste gas from the cars pollute our environment seriously.It effects not only ourselves but also our next generation.So I think we shouldn't have more cars in the future.