Mistakes serve as vivid,sometimes painful deterrents from certain action.
细例2：A friend of mine suffering from smoking-induced lung disease would remember the emotional and physical pain associated with the side-effects of tobacco usage.Not only does he recall the smell of hospitals,the imprint of pain on the face of someone who died from smoking,but he would also link these memories immediately with cigarettes.
观点3：
You cannot judge a person only by his or her appearance.
细例3：Susan Boyle is one of those.Such an appearance has long been rumored,but her incredible voice and stunning performance on BGT has won her great popularity.
