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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The financial rescue plan passed by the US Congress is viewed as flawed but necessary to head off panic in financial markets and loss of confidence in the economy.
Alopecia areata (mild - medium level) usually shows in unusual hair loss areas e. g. eyebrows, backside of the head or above the ears where usually the male pattern baldness does not affect.