如果产生了异常，那么就会对那个限定了作用域的变量进行赋值：如清单18中的EL表达式所显示的那样，该变量的值将不会为空。
If an exception was raised, then assignment to the scoped variable will occur: as the EL expression in Listing 18 suggests, its value will not be empty.
如果一个名字声明为全局，那么所有的引用与赋值直接进入包含模块全局名字的中间作用域。
If a name is declared global then all references and assignments go directly to the middle scope containing the module's global names.
如果一个命名声明为全局的，那么所有的赋值和引用都直接针对包含模全局命名的中级作用域。
If a name is declared global, then all references and assignments go directly to the middle scope containing the module's global names.
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