I consider life means three things to me.
First, life is hard work. For example, if we can do a part-time job besides our full-time job, we can earn more money and afford nice food, a nice house, or even a nice car. Second life means enjoyment. We should enjoy ourselves because we only live once. We should enjoy ourselves by developing our hobbies and interests such cooking and reading. And third, life means decision. We make decision all our life, for example, on what we should learn, which university we should go to, where we should work, where we should live and whom we should marry.
In a word, I think life means work, enjoyment and decision.
The air pollution is harmful and it can be solved.
The air pollution does harm to people. It causes people to suffer from some illnesses such as a headache and a couth. And it affects the environment, too. For example, in some heavily-polluted areas, plants do not grow well or can’t grow at all. But something can be done to solve the problem. First, we can develop a good public bus transportation system to reduce the number of cars on the roads. Cars are the main source of air pollution in many places. And second, we can move all the pollution-causing factories out of cities.
To sum up, something can be done to solve the serious problem of air pollution.
1、表并列结构或并列：and,both…and…,neither…nor,not only…but also…
3、表转折点或妥协：but,although,though,however,even though,inspite of,on the contrary
5、表例举：for example,such as,that's to say
6、表注重：in fact,of course,besides
7、表先后顺序：when,after,before,as soon as,soon，after
8、表逻辑关系：because,since,as,for,for this reason，as a result
9、表结果：in a word,to sum up,in summary,in conclusion,on the whole