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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Rush to plant heat-lovers like tomatoes, peppers, eggplants, or annuals like petunias if you live where late frosts are common. Wait until after Memorial Day.

不要象很多急切热爱种植者一样，急匆匆地种植象西红柿、辣椒、马铃薯或者牵牛花等等那些一年生植物，因为一场晚霜随时可以要了它们的命，而晚霜在你住的地方是非常普通的，过了纪念日（一般是5月30日）再种吧。

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When the head begins to heat up, yawning acts as a natural "thermostat" by allowing cool air to rush in and bring the brain back down to a healthy temperature, research suggests.

科学家研究发现，当人的大脑开始出现过热时，打呵欠的动作就充当天然的“自动调温器”，让清凉的空气进入大脑，使大脑温度恢复到健康水平。

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