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。
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.
冷色使人们想起清凉或寒冷，如蓝色，绿色和紫色。
Cool colors make people think of cool and chilly colors like blue, green and purple.
夏日炎炎，我们需要开启空调来调节温度，使整个夏天舒爽清凉。
In summer, we need to open the air conditioning temperature, make the whole summer cool and comfortable.
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