If an unknown class is referenced only in the implementation class (the bean class of the EJB) either as a return object or in the code, the AAT tool does not check for this class.

如果一个未知的类只在实现类(EJB的bean类)中被引用，作为返回对象或者在代码中，那么AAT工具将不检查这个类。

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This step requires a default service class, for which messages of unknown priority type can be assigned.

此步骤需要一个缺省服务分类，用于分配未知优先级类型的消息。

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When you want to add arbitrary behavior to a class, based on unknown criteria, you need to use a different technique.

当想要基于未知规则给一个类添加任意行为时，则需要使用一项不同的技术。

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Class actions are virtually unknown in Europe.

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Our analysis yielded thousands of data points and unearthed two critically important trends that we think are widely misunderstood or unknown by the VC ecosystem, the limited partners in the asset class, and the media that covers it.

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