Procedure and block scope are closely related.
过程范围和块范围密切相关。
The nicest thing about categories is the inherent scope limiting of the lexical block.
categories的好处是固有的词典块范围限制。
Within the scope of the with_interface block, the radius method defined with that interface name exists and can be called.
在with _ interface代码块的作用域中，可以调用使用该接口名定义的radius方法。
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