这些对象引用参数在部署描述符（将在运行时解析）中作为资源引用公开。

These object reference parameters are exposed as resource references in the deployment descriptor which will be resolved at run time.

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返回的对象还实现了MDB在它的部署描述符中声明的接口。

The object returned also implements the interface that the MDB declared in its deployment descriptor.

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相比之下，即使可以通过实例进行访问，描述符仍然属于类级别对象。

In contrast, the descriptor remains a class-level object, even though you can access it through the instance.

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