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."丹在教他的儿子怎样拳击。他告诉他的朋友：“这是一个粗暴的世界，所以我要教我的儿子怎么去拼搏。”朋友：“如果他碰上的对手是一个比他高大，健壮而且也会拳击的人怎么办？”丹：“我也会教他怎么样赛跑呢。”