求翻译This is why,for example,we can understand how a lens focuses light without concern about the motion of each of the atoms of which the lens is composed.
问题描述：
求翻译This is why,for example,we can understand how a lens focuses light without concern about the motion of each of the atoms of which the lens is composed.
答
这就是为什么,打个比方,我们轻而易举就能理解透镜是如何聚光,但我们没必要去考虑组成透镜的原子是如何运动的.