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1·A sealed class cannot be used as a base class.

密封类别不能当做基底类别使用。

2·What is the difference between a class having private constructor and a sealed class having private constructor?

的区别是什么类拥有私有构造函数和一个密封的类有私有构造函数吗？

3·Because they can never be used as a base class, some run-time optimizations can make calling sealed class members slightly faster.

由于密封类从不用作基类，所以有些运行时优化可以使对密封类成员的调用略快。

4·We'll learn one technique that helps when we discuss sealed class hierarchies in the section called sealed class hierarchies in Chapter 7, the Scala Object System.

我们会在《第7章- Scala对象系统》的“完成类(sealed class)结构”讨论完成类的结构时学习到其中一种技术。

5·We see that UnitsSystem is a sealed case class with no attributes.

我们看到，UnitsSystem是一个密封的case类，没有属性。

6·Completing the object model (sealed, abstract class attributes and many other details have been addressed).

完善了对象模型(密闭、抽象类属性和许多其他细节都已经解决)。

7·Then social progress stopped - a study comparing the fate of children born in 1958 with those born in 1970 shows the latter more hermetically sealed into the social class of their birth.

于是社会停止了进步——有一项研究比较了分别出生于1958年和1970年的孩子的命运，发现后者被出身束缚得更紧。

8·How to define members of a sealed abstract class in a nice way?

如何在一个很好的方式定义一个密封的抽象类的成员？

9·This class has to be sealed since the build engine instantiates its own copy of this type.

由于生成引擎会实例化自己的这种副本，因此必须密封此类。

10·A class member, method, field, property, or event, on a derived class that is overriding a virtual member of the base class can declare that member as sealed.

若类别成员、方法、栏位、属性或事件是位于覆写基底类别虚拟成员的衍生类别上，则可宣告为密封。