【英语时差8,16】动物肚皮上的轻皮毛（下）

 How ?It’s because whether you evolved in the savannas¹ of Africa or the woods of North America, the sun was always in the same place: overhead. That means more light comes from above than below. True, light gets reflected back up from the ground, but not as much as comes down from the sky. More light lands on a four-footed animal’s back than on its belly², making the back brighter and the belly darker. That’s no good for hiding. Think of it this way. If you are in a green forest, you might hide yourself by wearing green clothes. Then you’d blend in. But if your pants are dark green and your shirt bright green, you will once again stand out. By having a pale belly and a dark back, animals balance out the amount of light that reflects off their bodies. The dark back absorbs more, the pale belly reflects more. The contrast between top and bottom is diminished, and it is easier to blend in.

1 savannas   

n.（美国东南部的）无树平原( savanna的名词复数 )；（亚）热带的稀树大草原

参考例句：

• Therefore the jungles and the savannas know of no juvenile delinquency! 因此，丛林和荒原里没有“少年犯罪。” 来自辞典例句
• My soul flits away into the virgin forests and to the savannas. 我的灵魂飞向森林中的处女地和广漠的平原。 来自互联网

2 belly   

n.肚子，腹部；(像肚子一样)鼓起的部分，膛

参考例句：

• The boss has a large belly.老板大腹便便。
• His eyes are bigger than his belly.他眼馋肚饱。