英语小笑话:Boxing and Running拳击和赛跑

Boxing and Running
 　　Dan is teaching his son how to box. As he does so, he left his friend, "This is a tough world, so I’m teaching my boy to fight."
　　Friend: "But suppose he comes up against someone much bigger than he is, who’s also been taught how to box."
　　Dan: "I’m teaching him how to run, too."