这些嵌套标签不是输出到文件中，而是输出到内存中的临时变量中。
Instead of going to a file, these nested tags go to a temporary variable in memory.
为什么说在一个变量。文件将为每个分配内存。C文件包含它，它是ANSI C ？
Why declaring a variable in a. H file will allocate memory for each. C file includes it, Is it ANSI c?
共享资源包括内存中的数据比如实例或类变量和外部对象比如文件、数据库连接以及网络连接。
Shared resources include in-memory data such as instance or class variables and external objects such as files, database connections, and network connections.
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