These container components are an easy way to group similar, related components together.
这些容器组件可以方便地把相似、相关的组件分组在一起。
The placement group (identified as a PGID) is a conceptual container for objects.
放置组(标识为PGID)是一个对象的概念容器。
Let's fix that by creating a new container object called a Group that can hold a bunch of GraphicsObjects.
让我们通过创建一个新容器对象group来实现这种功能,其中保存了一组GraphicsObject对象。
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