【英语时差8,16】红外线下的脸庞看起来不赖

The traditional answer to this question was that most of the sun’s radiation is visible light, so our eyes evolved to see those wavelengths¹. However, the sun also gives off a whole lot of infrared² radiation. What would it be like if our eyes evolved to see infrared light? If we could see infrared, the sky would appear dark, and grass and trees very bright. Our veins³ would shine darkly through our skin, and warm blooded creatures would be very easy to spot. That would be a great advantage not only for predators⁴ on the prowl, but also escaping prey⁵. No one knows for sure why animals and plants on earth evolved to perceive visible light, rather than infrared. One theory is that maybe there’s no biochemical reaction that would allow us to translate infrared light into a visual image we can perceive, as we do with visible light. Or, maybe evolution just hasn’t found it yet.

1 wavelengths   

n.波长( wavelength的名词复数 )；具有相同的/不同的思路；合拍；不合拍

参考例句：

• I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话，因为我们俩完全不对路。 来自《简明英汉词典》
• Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句

2 infrared   

adj./n.红外线(的)

参考例句：

• Infrared is widely used in industry and medical science.红外线广泛应用于工业和医学科学。
• Infrared radiation has wavelengths longer than those of visible light.红外辐射的波长比可见光的波长长。

3 veins   

n.纹理；矿脉( vein的名词复数 )；静脉；叶脉；纹理

参考例句：

• The blood flows from the capillaries back into the veins. 血从毛细血管流回静脉。 来自《简明英汉词典》
• I felt a pleasant glow in all my veins from the wine. 喝过酒后我浑身的血都热烘烘的，感到很舒服。 来自《简明英汉词典》

4 predators   

n.食肉动物( predator的名词复数 )；奴役他人者（尤指在财务或性关系方面）

参考例句：

• birds and their earthbound predators 鸟和地面上捕食它们的动物
• The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》

5 prey   

n.被掠食者，牺牲者，掠食；v.捕食，掠夺，折磨

参考例句：

• Stronger animals prey on weaker ones.弱肉强食。
• The lion was hunting for its prey.狮子在寻找猎物。