This is because their colors are not bright enough to be noticed by the human eye.
这是因为它们的颜色不够明亮，无法被人眼注意到。
Moonbows appear on the opposite side of the moon and usually look white to the human eye.
月虹出现在月亮的另一侧，它们在人眼中通常看起来是白色的。
Plants are also able to distinguish between specific wavelengths of light that the human eye cannot even see!
植物还能分辨出人类肉眼看不到的特定波长的光！
The human eye is a biological marvel.
人类的眼睛是生物学上的奇迹。
Like the human eye, the camera records reflected light.
就如同人眼，相机记录反射光。
The human eye can detect more than 10, 000, 000 different colors!
人类的眼睛可以分辨超过10 000 000种不同的颜色。
"They look at everything with the human eye," NASA's Yeomans says.
“一切都靠他们的肉眼观察，”美国航空航天局的约曼斯说。
It is the most restful color for the human eye; it can improve vision.
对人眼而言，它是最放松的颜色；它可以提高视力。
Because of its high temperature, it appears blue-white to the human eye.
由于它的高温，似乎在人眼看来为蓝白色。
These are determined by the laws of optics and the nature of the human eye.
这是由光学定律和眼睛的特性决定的。
The technique enables us to capture light that is invisible to the human eye.
这种技术让我们能够捕捉到人眼不可见的光线。
The smallest objects that the unaided human eye can see are about 0.1 mm long.
人类肉眼可以看到的最小的物体大约0.1毫米长。
To the human eye, orange is a very hot color, so it gives the sensation of heat.
在人眼看来，橙色是热力四射的颜色，因此它给人以热的感觉。
Today, telescopes take pictures using forms of light hidden from the human eye.
今天的望远镜使用一种肉眼无法看到的光线拍摄图片。
Motion Shots - Shoot subjects that move to fast for the human eye to follow and see clearly.
动作拍摄-拍摄那些对于人眼而言移动太快而难以跟随或者看清楚的物体。
These changes, imperceptible to the human eye, occur as the heart pumps blood through the body.
这些人类眼睛无法知觉的变化发生在心脏将血液泵向全身的时候。
A third contributor, who came closer to the majority view, said: "Ah, the human eye can be tricked so easily."
另一位网友的观点则代表了大多数人的看法：“人类的眼睛总是容易被骗。”
Indeed, the theoretical maximum gamut of a laser-based system is almost 90% of what the human eye can perceive.
确实，激光系统的最大色域理论上可以接近人眼能感知范围的90%。
The human eye is a highly non-linear device, and web-users can instantly recognize edges, patterns and motions .
人类的眼睛是一个高度非线性运作的设备，网页用户能够直觉地识别边界、模式和运动。
And when, Sirs, this pale flame has sprung into the air swaying to every wind, it brings vision to the human eye.
先生们，当这簇微弱的火焰在空气中绽放、随风摇曳时，它为人类的眼睛带来了景象。
Although the microscopic creatures look beautiful in photographs, many are not even visible to the human eye.
尽管这些显微生物在照片上是多么的美丽，但很多仅用肉眼却不可见到。
Of all the eyes in the animal kingdom, the human eye isn't the most efficient but it is still amazingly adaptable.
与动物王国中所有动物们的眼睛比起来，人类的眼睛并不是最高效的，但却具有令人惊叹的适应性。
The stars that the human eye can distinguish in the night sky are relatively near and are all part of the Milky Way.
夜空中人眼可以分辨的星星离我们相对较近，它们都是银河的组成部分。
The human eye reacts differently to a computer screen than a piece of paper, so how you format your e-mail is vital.
人眼对电脑屏幕和纸张的反应不同，所以如何安排电邮的格式非常重要。
Three new genetic loci have been identified with involvement in subtle and quantitative variation of human eye colour.
三种新的基因位点与人眼颜色的微小及定量变化有关。
"Looking up at the Moon, its surface appears painted with shades of grey, at least to the human eye," explained Robinson.
“抬头仰望月球时，人类的肉眼至少会看到月球表面呈深浅不一的灰色，”罗宾逊解释道。
The Firefox (browser) can see things that the human eye can't, too, but a lot of it doesn't get used for anything. So far.
火狐（Firefox）浏览器也可以看到人们看不到的东西，但迄今为止，这些东西还没有得到利用。
The human eye is incredibly good at recognizing complex behavior and spotting trends and patterns in visually displayed data.
在直观显示数据时，人类的眼睛在识别复杂的行为、运动轨迹和图案时表现得出奇地好。
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