POID提供了一个生命期较长的对象，它的全局标识的作用域可以跨越空间和时间。
POIDs provide a long lived object with a global identity that transcends space and time.
Scoped内存就是一块内存，它有一个由应用程序开发者定义的生命期。
Scoped memory is memory that has a lifetime defined by the developer of an application.
Scoped内存就是一块内存，它有一个由应用程序开发者定义的生命期。
Scoped memory is memory that has a lifetime defined by the developer of an application.
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