IncludeFolderChildren Retrieves child documents and folders in a single request when retrieving a folder object.

IncludeFolderChildren在查询一个文件夹对象时，在同一个请求中查询它的子文档和文件夹。

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Later on, if I need this folder object again, I can get it from this cache rather than making another round trip to get it.

如果稍后再次需要这个文件夹对象，可以从这个缓存获取它，而不是再往返一次去获取它。

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