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：
注意：加密文件之后如果忘记了用来加密该文件的密码，再想恢复出原始文件就不可能了。当然，这与密码本身的复杂程度有关，要想保证文件的安全，最好采用较复杂的密码，例如混合运用字母、数字和特殊字符（如“$”符号等）。
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To unzip just one file or folder, open the zipped folder, then drag the file or folder with the zipped folder to a new area.
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更详细的对比示例留待读者在实践中对此进行讨论，并行计算为托管代码在多核环境下的性能优化提供了统一的解决方案，而未来我们会做的更好。
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而这种原始转换（由子类转换为父类）方向相同的可变性，被称为协变（covariant）；其反向操作则被称为逆变（contravariant）。当同样的情形应用于泛型时，例如：
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