我听说河马出的汗是红色的,像血液一样的颜色,这是真的吗?A:河马是一种大型哺乳动物,它的皮很厚,但是身上几乎没有毛。当河马在岸上晒太阳时,它皮肤上的水分蒸发非常快,使得皮肤容易被炙热的阳光晒伤,发生干裂。因此,河马的皮肤会分泌出一种红色的黏液,黏液不仅能防晒,而且能让皮肤保持湿润和防止蚊虫叮咬。由于黏液是红色的,因此常被人们误认为河马排出的是血汗。 Is it true that I heard that the sweat from the hippopotamus is red and blood-like? A: The hippopotamus is a large mammal with a thick skin but little hair. When the hippo basks in the sun, the water on its skin evaporates very fast, leaving the skin vulnerable to sunburn and sunburn. As a result, the hippopotamus’s skin secretes a red mucus that not only protects the skin but also keeps the skin moist and prevents mosquito bites. Because mucus is red, it is often mistaken for hippo is the blood and sweat.