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Creates a new modifiable state holder.

创建新的可修改状态容器。

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The lifetime of the state holder is one request.

状态容器的生命周期为一个请求。

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Figure 2 shows that the state holder is a wrapper enclosing the un-typed document model.

图2表明了状态容器实际是非类型化文档模型的包装。