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。

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This captures the heat pattern of blood vessels near the skin, betraying both changes in overall temperature and in heart rate.

这个设备能够获取皮肤表面血管的温度信息，它们透露出总体温度和心跳频率的变化。

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But when researchers blocked production of that heat shock protein and let mosquitoes feast, the blood meal sat longer in their guts.

但是当研究者阻止了那种热休克蛋白的产生并让蚊子吸食的时候，所吸食的血在它们的肠道里待的时间更长。

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