Nowadays more and more families own private cars。 Private cars， as the product of modem civilization， have been playing a vital role in people"s daily activities。 First， private cars are a convenient means of transportation。 You can go wherever you like。 Secondly， there is no doubt that private cars will have a great impact on the economic growth。 The rapid car industry growth will contribute much to keeping the country"s economy growing at a higher rate in the near futrue。

But every coin has two sides。 The development of the private cars will bring about a series of problems。 For example， the polluted air given off by cars will do great harm to our health， too many private cars will lead to traffic jams and a great deal of energy will be wasted and so on。

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So I think we should take advantages of private cars and make them serve us better。 Meantime we hope that satisfactory solutions to these negative problems will be found soon。