Without air nothing can live.Although we cannot see it,there is air around us.So air is everywhere and it gives life to every living thing.Without it all living things will die.
Bad air makes people ill.We must have fresh air to keep us in good health.In the city,there are a great many people and there are too many cars running on the roads.The gas that the cars give out is full of dirty things.Every day we breathe in the waste gas again and again.This makes us become ill.So people should go outdoors as much as they can.
Besides so many cars,there are many factories,too.From the chimneys of these factories,we can see the smoke is usually black or grey in color.This kind of smoke is dangerous to our health.This is because there are many small harmful things and gas in the smoke.So if we want to keep healthy we must go out to the country to breathe more fresh air.Or we can go up hills to get more fresh air.
沒有空氣生物都無法生存.雖然我們看不見它,有空氣在我們周圍.所以空氣無處不在,它給生活一切生物.沒有水,所有生物都將死亡.
壞的空氣使人生病.我們必須有新鮮空氣來保持我們身體健康.在這個城市里,有很多人,有太多的汽車在道路上運行.,汽車排出的尾氣全是有害的物質(zhì).我們每天都不斷地呼吸著廢氣.這使我們生病.所以人們應該盡可能多的去戶外走動.
除了這么多汽車,還有很多工廠.從這些工廠的煙囪里,我們可以看到煙通常是黑色或灰色的顏色.這種煙對我們的健康是很危險的.這是因為有許多小的有害物質(zhì)和氣體煙霧.所以,如果我們想要保持健康我們必須去鄉(xiāng)下呼吸更多的新鮮空氣.或者我們可以去上山來得到更多的新鮮空氣.