还要设置变量作用域，以限制变量只在某个“会话”中活动。

Set the variable scope to limit variables to live only within a "session".

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例如，在第6章中对栈和寄存器结构的解释要联系到第4章中对变量作用域的解释。

For example, the explanation of stacks and register frames in Chapter 6 connected with Chapter 4's explanation of variable scope.

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使用长期运行的对话，允许变量保持作用域直至对话结束，而不仅仅是单个请求。

Using a long-running conversation allows variables to remain in scope until the end of the conversation, instead of merely for a single request.

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