对于源代码的一项更实质性的限制是不能引用在所添加的声明或者块外声明的局部变量。
A more substantial limitation on the source code is that there's no way to refer to local variables declared outside the statement or block being added.
这个算法的限制是局部元素不能声明为与全局元素同名。
The constraint of this algorithm is that a local element is not allowed to be declared with the same name of a global element.
局部变量的生存期被限制为定义它的块的生存期。
The lifetime of a local variable is limited to the lifetime of the block in which it is declared.
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