There's really only two statements that even have the same content.

其实只有两则声明内容是相同的。

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Now because among its contents is the prototype for print F, that is why, very simply, I can call print F without having to declare its prototype myself.

现在因为在它的内容中是printf的原型，这就是为什么我可以不声明printf函数的原型,而可以调用它。

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