He'd also seek out patients undergoing bloodletting in order to take all their life juice for himself.

他还会寻找正接受治疗的病人，以便把他们的液都拿来自己喝掉。

It is not clear that such bloodletting is required.

目前尚不清楚是否需要这样的。

They also memorized poems to commit information to memory— such as one identifying where on the body bloodletting should be performed.

他们还通过背诵诗歌来记，比如一首确定应该身体的哪个部位进的诗歌。

So, maybe all those bloodletting patients from the past didn't understand what improvements in biomarkers meant, but found that they felt a little better.

所以，也许过去所有的病人都不明白生物标记的改善意味着什么，但他们发现自己感觉好了一点。

For 3,000 years, people have been cut or given leeches to let out the blood because they thought that would make people better.

长达3000年的时间里，人们划破皮肤或使用水蛭吸，因为他们认为能够改善他们的身体。

And I happen to see this really tiny study which had the unpromising name, sub-lethal behavior and physiological effects of the biomedical bleeding process on the American horseshoe crab, Limulus Polyphemus.

我碰巧看到了这项非常微小的研究，它的名称、亚致死为以及对美洲鲎（Limulus Polyphemus）生物医学过程的生理影响都没有什么希望。