參考范文：

　　No air means death. Although we can't see it, there is air round us.So air is everywhere and it gives life to every living thing. Without it we can't live. Bad air makes people ill.We must have fresh air to keep us healthy.In the city there are a great many people and there are too many cars running on the roads. The gas which the cars spread out is full of poison.

　　Every day we breathe it in and out.Besides so many cars, there are many factories too.From the chimneys of these factories, we get the smoke usually in a black or grey color. This kind of smoke, when it mixes with the air, is dangerous to our health.

　　It is because smoke contains many small poisonous soils and gases. So inorder to keep healthy we have to go out to the countryside to breathe more fresh air. Or we can go up hills to get more fresh air.

　　參考譯文：

　　沒(méi)有空氣就意味著死亡。雖然我們看不見(jiàn)它,我們有空氣。空氣無(wú)處不在,它讓生活的每一個(gè)東西。沒(méi)有它我們無(wú)法生存。糟糕的空氣使人生病。我們必須有新鮮空氣來(lái)保持我們的健康。在城市里有許多人,有太多的汽車在道路上運(yùn)行。的天然氣汽車展開(kāi)充滿了毒藥。

　　我們每天都呼吸它。除了這么多汽車,也有許多工廠。從這些工廠的煙囪,我們得到煙通常在黑色或灰色的顏色。這種煙,當(dāng)它與空氣混合,對(duì)我們的健康是很危險(xiǎn)的。

　　這是因?yàn)闊煱�含許多小有毒土壤和氣體。所以為了保持健康我們必須去鄉(xiāng)下呼吸更多的新鮮空氣�；蛘呶覀兛梢缘玫礁�多的新鮮空氣。