摘要
人生难免会遇到困难与挫折，不要怨天尤人。想一想这个世界上还有一些人，他们遇到的打击远远超过我们，可他们仍然能够微笑，我们还能有什么抱怨的呢？
About ten years ago when I was a student in college, I was working at my university＇s Museum of Natural History. One day while I was working at the cash register （收银台） in the gift shop, I saw an old couple come in with a little girl in a wheelchair.
