Defines a method in the class called Echo that accepts a string as a parameter and returns a string as a result (functions and subs in classes are referred to as methods).

在类中定义方法echo，该方法接受字符串作为参数并返回字符串作为结果(类中的函数和sub被称为方法)。

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Defines a method in the class called Echo that accepts a string as a parameter and returns a string as a result (functions and subs in classes are referred to as methods).

在类中定义方法echo，该方法接受字符串作为参数并返回字符串作为结果(类中的函数和sub被称为方法)。

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