translation.en: The CSF fills the space that surrounds the brain, and wastes from inside the brain make their way out to the CSF, which gets dumped, along with the waste, into the blood.
translation.zh: CSF填充了大脑周围的空间。 来自大脑中的废物 从大脑中出来，到达CSF中 CSF和废物一起卸下，进入血液。