标准说，在转换单元中调用任何函数之前，所有对象都在同一翻译单元（也就是对应于单个源文件的目标文件）中初始化。在你的例子中，它看起来像是在同一个文件，所以 a 将被初始化 main（）

The standard says that all objects are initialized in the same translation unit (aka object file which corresponds to a single source file) before any function is called in that translation unit. In your example, it looks like they are in the same file, so a will be initialized before main() is called.

标准允许在运行时加载DLL的情况下进行延迟初始化。如果允许你的代码运行时链接，你不能说一切都在 main（）之前初始化。

The standard is allowing lazy initialization to occur in the event that a DLL is loaded at run time. If you allow run-time linkage of your code, you can't say that everything is initialized before main().