Here is a sample nesting structure.

这里有个嵌套结构的示例。

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Note how the structure is indented based on element nesting.

请注意，是如何根据元素嵌套来缩进结构的。

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Structure design for software system of tube sizing and nesting.

软件系统的总体设计问题。

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Structure design for software system of tube sizing and nesting.

软件系统的总体设计问题。

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