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".
在清单10中可以看出，所有变量作用域是由Seam处理的。
As you can see in Listing 10, all of the variable scoping is handled by Seam.
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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