Why do the pupils of our eyes change size?

问题描述:

Why do the pupils of our eyes change size?
知道的快!
回答,不是翻译!!!

问题:我们眼睛的瞳孔为何会改变大小?
回答:Because we have to adapt to environment of different light intensity.
因为我们需要适应不同光强度的环境.