It's semipermeable, meaning that it lets some thing pass in and out but blocks others.

它渗性的，意味着它可以让些东西进出，但会些东西进入。

And separating the two chambers is the semipermeable membrane.

分隔两个腔室的膜。

CSF analysis can also show an elevated protein concentration because the inflammation leads to a more permeable blood brain barrier, or BBB, which is a selective semipermeable barrier between the circulating blood and the central nervous system.

脑脊液检查也可有蛋白含量升高，由于炎症导致介于循环血流和中枢神经系统之间的膜屏障，即血脑屏障，通性升高。