该段代码的尾声（epilogue）将在分析factorial 代码时再作讨论，但总的来说，它的作用是结束堆栈框架并返回到先前的函数。
The epilogue will be discussed in the analysis of the factorial code, but it basically just takes down the stack frame and returns to the previous function.
实现作用域内当前名称空间声明堆栈的数据结构。
NsStack: a data structure that implements a stack of namespace declarations that are currently in scope.
当线程执行迭代时，作用域堆栈应如图1所示。
For a thread running an iteration, the scope stack would be as shown in Figure 1.
一些调试数据被用作其他作用，例如，包含文件名和行号数据在产生异常堆栈追踪时很必要。
Some of the debug data is used for other purposes; in particular, having filename and line number data is necessary for generating useful exception stack traces.
一些调试数据被用作其他作用，例如，包含文件名和行号数据在产生异常堆栈追踪时很必要。
Some of the debug data is used for other purposes; in particular, having filename and line number data is necessary for generating useful exception stack traces.
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