And if you look through the eye, or you look at the vessels on the white of the eye, in fact, you may be able to do this directly, without drawing any blood at all, or through your nail beds.
如果你通过观察眼睛 或者观察白眼球部分的血管， 事实上，你可以这么做 这就可以直接作出诊断而不需要抽取任何的血， 又或者可以通过甲床来作出诊断。