这些代码与本文中所有文档模型的代码在本质上是相同的，所以在剩余的示例中我将跳过它，不再做任何讨论。
This code is essentially the same for all the document models in this article, so I'll skip over it in the remaining examples without any discussion.
这些代码与本文中所有文档模型的代码在本质上是相同的，所以在剩余的示例中我将跳过它，不再做任何讨论。
This code is essentially the same for all the document models in this article, so I'll skip over it in the remaining examples without any discussion.
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