?

Like humans, most animals rely on visible light for seeing, and plants rely on it for photosynthesis. In addition to the light that's visible to us, the sun also radiates ultraviolet and infrared light.
和人類一樣，大多數(shù)的動(dòng)物需要依賴可見(jiàn)光才能看見(jiàn)東西，而植物則需要光來(lái)進(jìn)行光合作用。除了可見(jiàn)光，太陽(yáng)的輻射還包含紫外線和紅外線。

Snakes have infrared sensors, and bees can see some ultraviolet light, but they're among the few exceptions to the rule. Why are we earth dwellers so attuned to visible light, instead of some other segment of the spectrum?
蛇可以感知紅外線，蜜蜂可以看到部分紫外線，但是它們都屬于極個(gè)別的情況。為什么地球生物的眼睛都對(duì)可見(jiàn)光如此情有獨(dú)鐘卻對(duì)其他光線“視而不見(jiàn)”呢？

Why Don't We See Ultraviolet Or Infrared?
為什么我們看不見(jiàn)紫外線和紅外線？

The traditional answer to this question was that most of the sun's radiation is visible light, so our eyes evolved to see those wavelengths. However, the sun also gives off a whole lot of infrared radiation. What would it be like if our eyes evolved to see infrared light?
一般對(duì)這一問(wèn)題的回答是：大多數(shù)的太陽(yáng)光都是可見(jiàn)光，所以我們的眼睛在進(jìn)化過(guò)程中已經(jīng)形成了選擇性偏好。然而，太陽(yáng)的不可見(jiàn)光輻射也不在少數(shù)，要是我們眼睛能夠進(jìn)化成可見(jiàn)其他光線會(huì)是什么景象？

If we could see infrared, the sky would appear dark, and grass and trees very bright. Our veins 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 predators on the prowl, but also escaping prey.
如果我們能看見(jiàn)紅外線，天空會(huì)看起來(lái)顏色暗淡，而綠草和樹(shù)木則會(huì)非常明亮。我們的血管會(huì)在皮膚之下閃著暗暗的光，溫血?jiǎng)游飼?huì)非常醒目。無(wú)論對(duì)于捕獵者還是獵物來(lái)說(shuō)，這都會(huì)成為一項(xiàng)極大優(yōu)勢(shì)。

Visible Light
可見(jiàn)光

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.
沒(méi)有人能夠解釋為什么地球生物在進(jìn)化過(guò)程中形成了對(duì)可見(jiàn)光的青睞。有理論稱，大概是因?yàn)椴淮嬖谀軌蚴刮覀儗⒉豢梢?jiàn)光可視化的生物化學(xué)反應(yīng)，或者，可能還沒(méi)進(jìn)化到那個(gè)階段吧。