health, surrounded by, smog, anything but, gases, impurities, absorb, poisonous, try hard, blacked out We all know that clean air is important to good health. Wherever you go and whatever you do, you are always surrounded by a sea of gases
参考范文： No air means death. Although we cant see it, there is air round us.So air is everywhere and it gives life to every living thing. Without it we cant live. Bad air makes people ill.We must have fresh air to keep us healthy.In the
没有空气我们就不能活，......请以fresh air为话题，写一篇短文。 提示词：villagers,more healthy,than,towns,air,fresh,all day in the fields,breathing fresh clean air,cities,full of smoke,dust,diseasepoeple in villages are healthier than people
air n.空气；空中；外观；affair n.事件；事情；armchair n. 扶手椅子；aupair a.国外来的(姑娘)帮助料理家务换取住宿的；chair n. 椅子；大学的讲座；(会议的)主席；vt. 当…的主席，主持，等。
air pollution是大气污染的意思，属于不可数名词。例句：Cases of breathing difficulties increase in lockstep with air pollution. 呼吸困难的病例随空气污染的加剧而增加。