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。
Let it be quick now, was all I could hope as the flow of blood from my head sucked my consciousness away with it.
让一切快点结束，是我现在全部的愿望。从我的头上流下的鲜血带走了我的意识。
Wear roomy clothing, especially at the wrists and ankles, to let blood flow to the extremities.
穿着宽松的衣服，尤其在腕部和踝部，让血液流到末端。
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