1.
"anatomists learn about the parts that can be seen with the unaided eye, and about the parts that can be seen only through a microscope."
解剖学家了解肉眼看得见的部分，也了解只有用显微镜才看得见的部分。
2.
Fear of danger is ten thousand times more terrifying than danger itself, when apparent to the eyes.
危险的恐惧，实在比我们肉眼看得见的危险本身还要千万倍地使人心惊肉跳。
3.
The centers of the drops are so small that the human eye cannot see them.
水滴的核心很小，小得肉眼看不见。
4.
It is invisible to the naked eye.
那是肉眼看不见的。
5.
It is only with heart that one can see rightly; what is essential is invisible to the eye.
一个人只有用心灵才能看得真确;重要的东西用肉眼是看不见的。
6.
"The same flesh and blood as oneself! Oh, I hope not!" exclaimed Lord Henry, who was scanning the occupants of the gallery through his operaglass.
“同样的血肉！我看不见得
7.
There exist all kinds of waves which can not be caught by our eyes.
太空中有各种各样肉眼看不见的波。
8.
With the naked eye only6 of these7 sister stars can be seen.
用肉眼只能看见7姐妹星中的6颗。
9.
These tiny creatures are hardly visible to the naked eyes.
这些微小的生物肉眼几乎看不见。
10.
Some stars are invisible to the naked eye.
有些星体肉眼是看不见的。
11.
These tiny creature be hardly visible to the naked eyes
这些微小的生物肉眼几乎看不见
12.
Microbes are too small to be seen by the naked eye.
微生物很小, 肉眼看不见.
13.
You can see it with the naked eye.
你可以用肉眼看见。
14.
This star is not visible to the naked eye.
这颗星肉眼看不见.
15.
Microbes be too small to be see by the naked eye
微生物很小, 肉眼看不见
16.
Microbes is too small to is see by the naked eye.
微生物很小, 肉眼看不见。
17.
Although we cannot see it,
尽管我们肉眼看不见，
18.
The star is visible.
那星星可以用肉眼看见。