And when the brain swells, it pushes against some of the fixed elements inside the skull.

当大脑开始膨胀, 它会对一些头骨内的固定结构施压。

Now however fixed these elements of reality may be, we still have a certain freedom in our dealings with them.

“但这些实在的因素，虽然都非常固定，而我们对付它们，还是有一定自由的。