当子区域中的程式码参考变数名称时，编译器就会解析对主导遮蔽变数的参考。
When code inside the subregion refers to the variable name, the compiler resolves the reference to the shadowing variable.
当子区域中的程式码参考变数名称时，编译器就会解析对主导遮蔽变数的参考。
When code inside the subregion refers to the variable name, the compiler resolves the reference to the shadowing variable.
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