一个类只继承自一个相关的有效性类型，然后通过添加类属性进行专门化(如果需要的话)。
A class simply inherits from a relevant validity type, and then specializes (if necessary) by adding a class attribute.
根据现有的大量证据，对不同类型干预措施的有效性作了如下等级划分。
From the mass of evidence available, the effectiveness of different types of interventions have been graded as.
组件值已经经过了类型转换和有效性验证，并被应用到模型对象中了，因此您现在可以使用它们来执行应用程序的业务逻辑了。
The component values will have been converted, validated, and applied to the model objects, so you can now use them to execute the application's business logic.
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