题目

 Everything happens for the best, my mother said whenever I faced disappointment. If you carry on, one day something good will happen. And you'll realize that it wouldn't have happened if not for that previous disappointment. Mother was right, as I discovered after graduating from college in 1932. I had decided to try for a job in radio, then work my way up to sports announcer. I hitchhiked to Chicago and knocked on the door of every station and got turned down every time. In one studio, a kind lady told me that big stations couldn't risk hiring an inexperienced person. Go out in the △ABC中，A=π3，AB=3，AC=8，则BC= ．