Today we can see cars everywhere.More and more people have cars.Our lifes have changed that it's more science and technology.In the one hand,cars have many advantages.It can makes us more convenient.We can drive it where we want to go.It can save times so that we don't have waiting bus.We don't have unbrella or raincoat when rainning.Cars help us very much.In the other hand,cars make accident easily.It will make traffic jam.We havn't opportunities to take exercise.So our healthy will broke down.The most important that the more cars the more pollute.We must protect our environment.In my opinion,we can park cars far away from somewhere where we want to go.We drive cars when rainning.We can go to work by bike in the shinning days.Let's protect our surroundings