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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：The area name of this website has actually been registered various a long time ago. Usually, the older the web site the more dependable it gets to be. On the other han