It's invisible to the naked eye.

因为它是肉眼不可见的。

Its high-speed cameras record microexpressions invisible to the naked eye.

它的高速摄像镜头可以捕捉到肉眼看不到的微表情。

His brush stroke so subtle as to be invisible to the naked eye.

他的笔触非常微妙，肉眼看不见。

Each person is a walking apartment building that houses a variety of micro-organisms invisible to the naked eye.

每个人都是一个行走着的公寓，体内有各种肉眼不可见的微生物。

As well as making objects close to invisible to the naked eye, the material also conceals them from infrared and ultraviolet imagers.

这种材料不仅肉眼不可见，还能使物体隐形于红外线成像仪和紫外线成像仪前。

Invisible to the naked eye, organisms called microbes swarm every surface.

肉眼看不见的是，被称为微生物的生物体遍布每个表面。

Invisible to the naked eye, they are ubiquitous.

肉眼看不见，它们无处不在。

Dust mites are tiny creatures, invisible to the naked eye.

【eye】尘螨是极小的生物，凭肉眼是看不见的。

Using a telescope, Galileo discovered stars that were invisible to the naked eye.

【invisible】伽利略用望远镜发现了肉眼看不到的恒星。

Through his telescope he could see millions of stars that were invisible to the naked eye.

【naked，nakedness，nakedly】通过望远镜他可以看见数以百万计肉眼看不见的星星。

If you put a drop of ordinary seawater under the microscope, you can see it's full of tiny organisms invisible to the naked eye.

如果将一滴普通海水放在显微镜下，你会发现它充满了肉眼看不见的微小生物。

So how could I prove the existence of something that was invisible to the naked eye?

那么如何证明肉眼看不见的东西的存在呢？

Although invisible to the naked eye, phytoplankton are so abundant that they are responsible for half of all the carbon absorbing photosynthetic activity on earth.

尽管我们肉眼看不见，但是浮游植物的数量太过庞大，它们承担了地球上一半的光合作用。

When you handed me back the card, what you didn't see was I looked at it so fast it was invisible to the naked eye.

当你把名片还给我的时候，你没有看到的是我看它的速度快到肉眼看不见。

In fact that was one of Galileo's first and most important discoveries: stars that were invisible to the naked eye were easily seen through his telescope, even though it only had a lens a few centimeters across.

事实上，这是伽利略最早也是最重要的发现之一：肉眼看不见的星星通过他的望远镜就很容易被看到，尽管它只有一个几厘米宽的透镜。