Low iron levels in the blood can cause severe fatigue.

血液中铁含量低会导致严重的疲劳。

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During sleep the automatic metabolic system is less responsive to carbon dioxide levels and oxygen levels in the blood.

在睡眠期间，自动的新陈代谢系统对血液中二氧化碳和氧气的含量反应并不灵敏。

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The virus is still active in the blood.

这种病毒仍然在血液中起作用。

《牛津词典》

Over the years,researchers have identified several substances in the blood that can serve as what they call cardiac biomarkers.

VOA: special.2009.07.15

Humoral refers to immunity in the blood and it's immunity that's in the blood in the form of antibodies.

体液免疫代表着血液中的免疫机制,血液中的免疫机制是以抗体的形式存在的

耶鲁公开课 - 生物医学工程探索课程节选

For the life of the flesh is in the blood, and I have assigned it to you for making expiation for your lives upon the altar."

因为活物的生命是在血中，我把这血赐给你们，可以在坛上,为你们的生命赎罪“

耶鲁公开课 - 旧约导论课程节选

They came up with a promising candidate, tweaked it so it would be absorbed in the blood as a pill and then performed the key experiment testing it in mice to see if it would shrink tumors.

WSJ: New Medical Strides Against Prostate Cancer

It is a molecule normally found in the walls of blood vessels that attracts clotting and immune cells in other words, it causes inflammation.

ECONOMIST: High blood pressure may originate in the brain

Part of this light is reflected back, and the pattern of reflection indicates activity in the tissue it has been reflected from in particular, changes in the flow of blood to that tissue.

ECONOMIST: Lie detection