北极熊不仅是体形最大的熊,也是最擅长游泳的熊。相较于其他熊类,它们有着修长的头和颈部,耳朵看起来格外的小。北极熊最明显的特征,便是全身白或微黄的毛色,所以又称作“白熊”。它的毛发是透明且中空的,以增加隔热性。北极熊的皮肤是黑色的,但我们一般只会看到黑色的鼻子。它们脚掌很大,脚底部多毛,并且有小的突起,犹如吸盘,便于在冰上行走而不滑倒,游泳更不 Polar bears are not only the largest bears but also the best bears to swim in. They have a slender head and neck compared to other bears, and their ears look exceptionally small. The most obvious feature of a polar bear is the white or yellow hair color, so it is also called “white bear.” Its hair is transparent and hollow to increase its heat insulation. The polar bear’s skin is black, but we usually only see the black nose. They have big soles, husks at the bottom of their feet, and small protuberances, like a suction cup, for walking on the ice without slipping or swimming more