用肉眼看上去它们像星星。
大多数星星肉眼看不见。
我们用肉眼看到的彩虹色的光属于可见光。
The light that we see with our human eyes as a band of rainbow color falls in the range of what's called visible light.
植物还能分辨出人类肉眼看不到的特定波长的光！
Plants are also able to distinguish between specific wavelengths of light that the human eye cannot even see!
巨人捡起一块石头，扔得那么高，肉眼几乎看不见了。
The giant picked up a stone and threw it so high that the eye could scarcely follow it.
水银是液态金属，行星水星是肉眼能看到的运动最快的天体。
Mercury is a liquid metal, and Mercury, the planet, is the fastest moving heavenly body that naked eyes can see.
也许你可以用双筒望远镜从太空中清楚地看到长城，但用肉眼却看不见。
Maybe you can see the Great Wall clearly from space with binoculars but not with the naked eye.
出现在肉眼面前的光亮，事实上是频率不同的光线的叠加。所以，这是量子化的。
What appears to the naked eye to be glowing is actually a superposition of different lines of distinct frequency. So, this is quantized.
但是我们能用探测器帮助我们找到其他陨石，而这些陨石也更容易通过肉眼发现。
But we can use metal detectors to help us find other meteorites, and they're easier to spot by eye.
检测技术可以在一秒钟内对玻璃带进行超过1亿次的测量，从而定位肉眼无法看到的瑕疵。
Inspection technology allows more than 100 million measurements a second to be made across the ribbon, locating flaws the unaided eye would be unable to see.
从一端到另一端，银河系布满星星的圆盘横跨12万光年，可以用肉眼和光学望远镜观察到。
From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.
水银是一种液态金属，而水星这颗行星，是肉眼能看到的运动最快的天体。火星，为什么火星是红色的？
Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, why is Mars red?
大多数指纹是肉眼看不见的，需要经过化学显影过程才能显示出来。
Most fingerprints can't be seen to the eye and require a chemical development process in order to make them shown.
通常，一年只有一到两颗彗星明亮得肉眼可见。
Usually there is only one or two a year bright enough to be seen with the naked eye.
由于肉眼检查不能识别某些皮肤变色和皮肤癌，诊所的皮肤科医生需要对病人的皮肤组织进行测试。
Because visual inspection cannot reliably distinguish certain skin discolorations from skin cancers, dermatologists at clinics have needed to perform tests of skin tissue taken from patients.
给它安装无线电设备是很困难的，而且仅凭肉眼观测也太不可靠，无法对它的行为进行确切的观察。
Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
这些星星是肉眼所看得见的。
这个极微小的双人舞肉眼是看不到的。
The microscopic pas DE deux isn't even visible to the naked eye.
它每分钟移动一英寸，用肉眼就能看到。
Its movement - an inch every minute - could be seen with the naked eye.
但专家告诫说，不能长时间肉眼注视太阳。
But they said no one should stare at the sun with naked eyes too long.
我们身体所发的光比肉眼能见的低1000倍。
The light we emit is about 1000 times lower than the naked eye can see.
有些生物微乎其微，是我们无法用肉眼看到的。
Some are so tiny that we simply can't see them with our own eyes.
这些不同全部都是肉眼可见。
评估肉眼检查在口腔癌筛查中的作用。
实际上，它是肉眼看不到的。
不幸的是，肉眼很难看出到底是什么搅乱了它们。
Unfortunately, with the naked eye it's hard to see exactly what makes them messy.
许多变化都是肉眼可见的。
古代的人们看到肉眼可见的五大行星在夜幕中闪烁。
Ancient man also noticed how the five planets visible to the naked eye twinkled in the night sky.
甚至大到用肉眼也可看见的物体也有一些量子性质。
Instead, even objects big enough to be seen with the naked eye can take on slippery quantum properties.
它每隔76年靠近太阳时，变得肉眼可见。
It becomes visible to the naked eye every 76 years when it nears the sun.
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