This is the final collection of practices in the current release of the Portfolio Management method.
这是Portfolio Management方法当前版本中最后一个实践集合。
This method instantiates an enumerator that takes a snapshot of the current state of the collection.
此方法实例化一个枚举数，该枚举数采用集合当前状态的快照。
This method is not called when removing items that were added in the current editing session because they are not yet part of the collection.
当移除在当前编辑会话中添加的项时，将不会调用此方法，因此这些项还不是集合的组成部分。
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