因此，该模式通常仅用于对目标进行只读访问的情况。

Therefore, this pattern is typically applied only in situations where read-only access to the target is sufficient.

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例如，浏览器使用渐进式渲染文件显示，他们必须处理，其中样式表无法访问的情况。

For example, browsers use progressive rendering to display documents, and they must handle situations where style sheets are not accessible.

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发生这种情况的两种常见场景分别是为读伸缩而做大量复制的情况和有复杂数据访问的情况。

The two common scenarios where this situation occurs are massive replication for read scaling and the cases with the complicated data access.

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