Sleep has all kinds of important neurological benefits like clearing out dead cells, managing your immune system, regulating your metabolism and storing memories.

睡眠对神经系统有很多重要的好处，比如清细胞，管理免疫系统，调新陈代谢和储存记忆。

The synovium's composed of loose connective tissue, blood vessels, lymphatic vessels, and on the surface—" Type A" cells that clear cellular debris and " Type B" cells that produce components of synovial fluid, which helps lubricate the two articular surfaces.

膜由松散结缔组织、血管、淋巴管组成；在膜表面，A型细胞清理细胞碎屑，B型细胞产生液成分，液能够润两块关的表面。