现在让我们来复习一下关于分布式环境中授权的一些基础知识，以及PLAM架构的一些术语。

Let's review the basics of authorization in a distributed environment and some PLAM architecture terminology.

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本文写作目的主要是复习1 -磷酸鞘氨醇的生物学特性和分布，及其在类风湿关节炎发病中的作用，进而讨论它作为类风湿关节炎治疗靶点的可能性。

The aim of this article was to review the biology and distribution of S1P, together with its role in ra, and to discuss its potential as a therapeutic target for ra.

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