Let me just mention some of its advantages

让我叙述它的一些
in the eyes of Hippocratic physicians.

在希波克拉底派的医师的眼中的优点
It was systematic, like disease itself.

静脉切开术像疾病一样是系统的
Its effects were immediate and you could control them.

它的效用是即刻的并且你可以控制
It was speedy.

很快速
Its limits were also self-evident to the experienced doctor.

对有经验的医生来说其局限是不证自明的
Perhaps the patient fainted,

可能病人会晕厥
the pulse disappeared,

脉搏会消失
or the color of the blood altered.

或者血的颜色改变
There were however, of course,

然而也必然有
contraindications to bloodletting:

放血的禁忌症
old age and efficiency of blood;

年纪大了和贫血