There was a doctor who claimed to be good at treating surgical cases.
有位医生，自称擅长治疗外科疾病。
One day, a general was struck by an arrow from the enemy on the battlefield. The arrow had penetrated into his flesh, so he called for the "surgeon".
一天，有位武将在战场上中了敌人的飞箭，箭头穿进了皮肉。他命人请来了这位“外科”医生。
The general told him what had happened. The "surgeon" said repeatedly:
武将把情况对这位“外科”医生一讲，他连声说：
"The treatment is easy！ The treatment is easy！"
“好治！好治！”
He took up a pair of sharp scissors, and with a snap cut off the exposed arrow shaft. He handed over the arrow shaft to the general and said:
只见他拿起一把锋利的剪刀，“咔嚓”一声，把露在皮肤外面的箭杆剪掉了。他就把箭杆交给武将，说：
"It's done. Please give me my pay."
“好了，请你付酬金吧！”
These words left the general not knowing whether to laugh or to cry. He said to the "surgeon":
武将被他弄得哭笑不得，对“外科”医生说：
"The arrow head is still in my flesh. You must get it out quickly."
“箭头还留在皮肉里面，必须赶快取出来呀！
The "surgeon" said:
”这位“外科”医生说：
"The arrow head in the flesh is a matter of internal medicine and has nothing to do with my `surgery'.，，
“箭头在皮肉里面，这是内科的事了，与我‘外科’无关。”