Observe that if the metaclass extension was to an abstract EClass, it will not show in the list.
注意到如果这个元类扩展以前是一个抽象的EClass，它将不会显示在这个列表中。
Also observe that we don't need to list the points in any order.
还要注意我们不必以任何顺序列出点。
Also observe that we don't need to list the points in any order.
还要注意我们不必以任何顺序列出点。
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