Blood vessels in the head tighten to stop the loss of body heat and then relax to let blood flow rise; that sudden rush of blood is what causes the headache.

头部的血管收紧以阻止身体热量的流失，然后放松让血液流动起来，血液的突然涌入是引起头痛的原因。

youdao

Let blood from the patient.

给病人放血。

youdao

Let blood drown the weak!

让血海淹没弱者吧！

youdao

"Well,I will not let you put yourself or this bar in danger.I won't." "True Blood" has completed its second season on the cable channel HBO.

VOA: special.2010.01.20

Being so caught up, So mastered by the brute blood of the air, Did she put on his knowledge with his power Before the indifferent beak could let her drop?

就这样被征服，这样被天空中野性的血液欺凌，她是否借他之力获得了知识,在那一意孤行的嘴放她下来之前？

耶鲁公开课 - 现代诗歌课程节选

Hopefully it's not a Snicker's bar but let's assume it is a Snicker's bar and your blood glucose is going to rise because you're taking a lot of sugar in.

但愿不是士力架,但假设你们吃了士力架,你们的血糖水平会升高,因为你们摄入了许多糖分

耶鲁公开课 - 生物医学工程探索课程节选

This let surgeons attend patients spouting blood without removing their coats an important distinction that set them apart from shirt-sleeved tradesmen of the lower orders.

ECONOMIST: Men's clothing

The reason it typically takes two days to conduct a blood test and it can take as long as five is that once a nurse takes a blood sample, it must be sent to a central lab where the blood is cultured or amplified in order to let any infections grow and then cleaned.

FORBES: MIT Spinoff, T2 Biosystems, Hopes To Slash Deadly Hospital Infection Deaths

All rely on catheters hollow tubes that let doctors burn away and reshape heart tissue or correct defects through small holes in blood vessels.

NPR: Heart Repair Breakthroughs Replace Surgeon's Knife