Dark matter is a form of stuff that does not interact with light, so cannot be seen, but makes its presence felt by exerting a gravitational pull on normal matter.
暗物质是一种不与光发生作用的物质，因而不可见。但是暗物质又是确实存在的，它与可见物质之间产生的引力效应证实了这一点。
One can witness a slightly yellower change in the color of the dog's skin, but to the naked eye, fluorescence cannot be seen without the presence of UV light and goggles.
人们可以看到狗的皮肤颜色稍微变黄，但对于肉眼而言，荧光在没有紫外光照射和未使用护目镜时不会被看到。
But this cannot be seen to happen only on Rwanda's terms.
但这一切却无法得到解决，除非按照卢旺达的条件来办。
Most Western journalists travel overseas with Western assumptions. They cannot understand how the West could be seen as anything but benevolent.
绝大多数的新闻工作者都怀着西方的构想漂洋过海，他们无法理解为什么人们就是看不到西方慷慨的一面。
Have you ever seen a young man and a young woman that were in love, but they cannot ever seem to find any time to talk to each other or be with each other—they just do not have time?
你见过一个男孩和一个女孩在恋爱，但是他们看起来没有交谈或者在一起的时候—仅仅是没有时间？
Of course the answers are no and yes, but outsiders cannot be blamed for asking existential questions about a nation that so recently had been seen as poised for take-off.
答案既是“是”，也是“不是”。对一个近来被视为正在腾飞的国家，局外人提出这种悲观的存在主义的问题，无可厚非。
However, if these pictures are not only flashed very briefly but are also hard to make out to begin with and have a grainy pattern displayed right after them, they often cannot be seen.
然而，如果这些影像刚开始的时候很难辨认出来，即使简短的呈现影像之后再呈现纹理图案，他们通常也是无法辨别的。
But he is so far away from the camera that his face cannot be seen.
但是他离摄像机太远了，面部还是看不清楚。
But it has been seen that a self-centered person cannot really be expected to change.
但是，不要期待以自我为中心的人真的会去改变。
The main house has two floors, but from the majority of perspectives this cannot be seen.
住宅的主要部分有两层楼，但在多数的视角并不能被看到。
The prince told him to send her to him, but the mother answered, "Oh, no, she is much too dirty. She cannot be seen."
王子要见见她，但是继母回答说，“哦，不行，她太脏了，不能见人。”
I cannot find any research on who clicks on social network site ads (does anyone know of any?), but based on what I've seen qualitatively, my hypothesis would be that heavy AD clickers are.
而我却没有找到任何关于社交网站广告点击者的具体研究(有谁知道点什么吗？)
Not all the substance is visible. Air cannot be seen but it is substance.
并不是所有存在的物质都是可以看得见的。空气看不见，但它是物质。
But they cannot be seen or touched.
但他们不能看不见，摸不着。
What is seen by a natural light cannot be denied, but a mere inclination may be towards what is false.
借自然之光所看到的无法否定，但是单单是倾向，那也可能倾向于错的事情。
The best and most beautiful things in the world cannot be seen, nor touched... but are felt in the heart.
世上最好最美的事物是看不见的，摸不到的…只有心性、感情和勇气可以察觉。
Real treasure lies not in what can be seen, but what cannot be seen.
真正的宝藏不在于所见，而在于所不见。
At night, for example, one cannot see things clearly. But if one USES torchlight, things can be clearly seen in the spot light.
例如，在夜晚你不能清楚地看见东西，但如果用一个手电筒，东西在光照下就能看清楚。
But in the sphere of a thousandzhangs (10 Chinese feet), carrots will not grow, and in the sky, the stars cannot be seen.
然而方圆千丈之内，连萝卜都不能生长，九天之上，星河也不能看见。
These ties cannot be seen, but we can feel them.
这些结是看不到的，但我们能够感受到它们。
"The best and most beautiful things in this world cannot be seen or even heard, but must be felt with the heart. " – Helen Keller.
世界上最美好的事情往往是看不见也听不见的，我们必须用心去感受。”海伦•凯勒。
The same is true of the charging position, which is a lunge, but as the effect cannot be seen dismounted, it will be explained mounted.
马刀冲锋也是同样道理，因为它就是一种突刺，不过由于步下无法练习冲锋，要留到后面马上训练时再讲解。
Maintain contact with casualties inside who can be seen or heard but who cannot be moved immediately.
对于不能立即救离而能够看到或听到的伤员，请与他们保持联系。
Maintain contact with casualties inside who can be seen or heard but who cannot be moved immediately.
对于不能立即救离而能够看到或听到的伤员，请与他们保持联系。
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