《太平广记·卷三百九十七·山（溪》
明白的人，可取一根小笔管，插入鼻孔中，用手指弹三五下，就流出黑色的血，过一段时间病就好了。
识之者，取水笔管，内于鼻中，以指弹之三五下，即出墨血，良久疾愈。
Knowledgeable people can take a small pen tube, insert it into their nostrils, and flick it three to five times with their fingers. Black blood will flow out and the disease will be cured after a period of time.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 识之者，取水笔管，内于鼻中，以指弹之三五下，即出墨血，良久疾愈。 [/INST] Knowledgeable people can take a small pen tube, insert it into their nostrils, and flick it three to five times with their fingers. Black blood will flow out and the disease will be cured after a period of time.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 识之者，取水笔管，内于鼻中，以指弹之三五下，即出墨血，良久疾愈。
user
Knowledgeable people can take a small pen tube, insert it into their nostrils, and flick it three to five times with their fingers. Black blood will flow out and the disease will be cured after a period of time.
assistant