With the development of economics as well as the improving life standard,
more and more people possess private cars.
As each coin has two sides, there are also disadvantages in such a trend.
First of all, the air and noise pollution is undoubtedly going from bad to
worse. The poisonous gas the private cars send out is not only of great harm to
the environment around us, but to our human bodies as well, especially to the
respiratory systems. Private cars, of their owners most are new drivers,
meanwhile, are consequently
