论文部分内容阅读
医学界流传着一则笑话:有位90岁的老人去看医生,说自己的左膝盖疼,医生说:“您已经90岁啦,有些疼痛是免不了的。”老人说:“我的右膝盖也有90岁了,为什么一点儿也不疼?”
A joke circulates in the medical profession: A 90-year-old man visits a doctor and says he has a pain in his left knee. The doctor said: “You are 90 years old and some pain is inevitable.” Right knee is also 90 years old, why do not hurt at all? "