Method definitions can also be nested.
方法定义也可以被嵌套。
Method definitions start with the def keyword.
方法定义由def关键字开始。
Programs include class and method definitions.
程序包含类和方法的定义。
In fact, method definitions — def — are no more than Ruby macros.
事实上，方法定义——def——仅仅是Ruby的宏。
Within the method directory we have test definitions.
在方法目录中有测试定义。
Within the method directory we have test definitions.
在方法目录中有测试定义。
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