class in UnityEngine.Experimental
切换到手册提供对子系统（通过插件提供额外功能）的访问权限。
提供查询 SubsystemDescriptor（枚举了功能）的功能。给定一个 SubsystemDescriptor，您可以创建 Subsystem 来利用子系统。
| GetInstances | 返回特定实例类型的活动 Subsystem。 |
| GetSubsystemDescriptors | 返回 SubsystemDescriptor（描述了可启用的额外功能）的列表。 |
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