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好处，比如清除死亡，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.

滑膜由松散结缔组织、血管、淋巴管组成；在滑膜表面，A清理碎屑，B产生滑液成分，滑液能够润滑两块关表面。