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命名参数和可选参数是两个比较简单的特性，对于熟悉其他编程语言的开发者来说可选参数并不陌生，为参数提供默认值时就是可选参数：Decide on the Verify box by Each and every form of file. (Make certain there’s very little critical inside your Recycle Bin in advance of emptying it.)These default