这允许结构中的元素引用结构实例后面紧接着的内存。
This allows the element in the structure to reference memory that follows and is contiguous with the structure instance.
弱得多的引用结构。
它包含了原始内存中对象的所有内容和引用结构。
It retains all the content and references structure of the original in-memory object.
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