聪明人知道自己不懂什么，蠢人则以为自己什么都懂。
The wise man knows he knows nothing, but the fool thinks he knows it all.
而作者则以为进化之时期有三：其一为物质进化之时期，其二为物种进化之时期，其三为人类进化之时期。
The writer considers that there are three degrees or periods of evolution: the first of matter, the second of species, and the third of man.
而大脑则以为反射光线是沿直线到达眼睛的，因此沿反射光线向后延伸，从而在镜子后面看到一个影像。
However, brain thinks that the reflected light comes to eyes in a straight line, so an image is seen behind the mirror just on the extending line of the reflected light.
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