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。
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。
图1显示了这个简单子类的uml图。
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.
为了查看子类层次，选择Incoming。
它们也可以被认为是将类映射到新子类的函数。
They can also be thought of as functions mapping classes to new subclasses.
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。
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.
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.
所提供的用于生成子类的基本实现有三种。
There are three base implementations provided for sub-classing.
这和阿尔法粒子类似。
任何子类数据的修改都涉及两张表：超类的表和子类的表。
Also any data change on a subclass involves two tables: the super class table and the subclass table.
相反，我向为每个子类执行适当的操作的子类添加额外的方法。
Instead, I add extra methods to the subclasses that perform the appropriate action for each subclass.
必须创建子类(即，创建继承它的类)，并创建该子类的实例。
You must subclass (that is, create a class that extends it) and create an instance of the child class.
您也可以在子类中重写规则函数，从子类中调用重写的父类函数。
You can also override regular functions in a subclass and call the overridden parent function from within the subclass.
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