科研之友
微信
新浪微博
Facebook
分享链接
摘要
<正>George went fishing, but at the end of the day he had not caught one fish. On the way back to camp, he stopped at a fish store."I want to buy three fish," he said to the owner."But instead of putting them in a bag, throw them to me.""Why should I do that?" the owner asked.
