People in villages are healthier than people in towns. That is because the air in villages is very fresh. Farmers are working all day in the fields, breathing fresh clean air. But there are too many factories in cities. They produce more and more harmful gases. At last,cities are full of smoke. And there's many dust in cities,too. It may cause a disease. So fresh air is very important to the people in cities. We need fresh air. So please don't pollute the air!

　　人在農村比城鎮更健康的人。那是因為鄉村的空氣很清新。農民整天在田里工作，呼吸新鮮空氣清新。但城市里有太多的工廠。他們生產越來越多的有害氣體。最后，城市充滿了煙霧。城市里也有很多灰塵。它可能會導致一種疾病。因此，新鮮的空氣對城市的人是非常重要的。我們需要新鮮的空氣。所以請不要污染空氣！