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.
薄荷-带给皮肤清凉镇定的感觉，使皮肤焕然一新。
Menthol - Creates a cool tingling sensation on the skin. Leaves skin feeling refreshed.
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