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：
Even though you don’t see updates that call for restarting, doing so makes sure that any pending updates are mounted.
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针对泄密的最佳防范措施就是加密。有效的加密不仅杜绝了泄密，而且还防范了由泄密引发的攻击。加密技术有时还用于通信过程中的身份验证——如果某个用户知道密码，那么他应该就是那个拥有这一身份的人。
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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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