美国想要取消电子类产品的关税。
America wants to eliminate tariffs on items such as electronics.
以下是一些常见的中国扇子类型。
通过添加包装程序类，您打破了子类型的多态性。
By adding a wrapper class, you have broken subtype polymorphism.
特别是，科幻小说是散文小说的一个子类，因为几乎每一部科幻小说都是短篇或长篇小说。
Especially, science fiction is a sub-class of prose fiction, for nearly every piece of science fiction is either a short story or a novel.
检查他们使用的句子类型，注意他们的隐喻，并专注于你认为可以写出很酷的续篇的故事。
Examine types of sentences they use, pay attention to their metaphors, and focus on stories you feel you could write a pretty cool sequel to.
特别是，科幻小说是散文小说的一个子类，因为几乎每一部科幻小说都是短篇小说或长篇小说。
Specially, science fiction is a sub-class of prose fiction, for nearly every piece of science fiction is either a short story or a novel.
具体的子类定义需要的不同行为。
Concrete subclasses define the different required behaviors.
减少了子类及其超类之间的耦合。
主表具有父类和子类的所有列。
The master table has all of the columns of the parent and all subclasses.
这允许子类根据需要仅覆盖一些方法。
'SSS '指出了错误消息子类。
在编程语言中，通过子类提供这一能力。
In programming languages, this capability is provided by subclasses.
具体子类的查询只生成该子类的SQL。
A query on a concrete subclass only generates SQL for that subclass.
这意味着该类的任何子类都无法声明终结器。
This means that no subclass of that class can declare a finalizer.
为何模式中没有子类？
层次结构将显示所选元素的子类型。
The hierarchy displays the subtypes for the selected element.
它是专门目的只适用于这些子类。
It is specifically only intended to apply to those sub classes.
子类必须提供每个方法的实现。
A child class must provide an implementation for each method.
通过这种策略，每个子类都会拥有其自身的表。
这个类有许多可以从不同来源构造图像的子类。
This class has a number of subclasses that can construct images from different sources.
类型和子类型之间用分号(；)分隔。
它允许从其他程序中轻松使用该子类。
列表值的引用存储在子类内。
哪些类别是顶级类别，哪些是子类别？
Which categories are the top-level categories, and which are sub-categories?
然后您可以使生成的代码生成子类，以添加功能。
Then you would subclass the generated code to add functionality.
我们已经见过几个父类和子类的例子了。
We've seen several examples of parent and child classes already.
封闭的箭头表示继承，从子类指向父类。
The closed arrow denotes inheritance and points from child to parent.
这个方法还会将正在显示的子类清单置空。
This method also blanks out the list of subcategories being displayed.
可能每个产品子类型还有它自己的子类型。
It is possible that each product subtype may have its own subtypes.
正被删除的类型化表不能拥有任何子类型。
The typed table that is being dropped cannot have any subtables.
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