They can even use those stacked cells to see how out of focus different parts of an image are in different layers.

它们甚至可以使用这些堆叠的单元格来查看图像的不同部分在不同图层中的失焦程度。

Also like the eel scientists wanted to stack their artificial cells up to increase the voltage, but how do you do that?

也像鳗鱼科学家想要将他们的人造细胞堆叠起来以增加电压，但你如何做到这一点？