So if you take a deeper look at the brain, one of the things, if you look at it in cross-section, what you can see is that you can't really see a whole lot of structure there.
所以如果你更深入地看看大脑， 其中一部分，如果你看它的横截面， 你能发现的是 你不能真正地看到整个的，大部分的大脑结构。