正如前面所讨论的，它是主题和主体的实现相关构造的替代物，出于我们的测试目的，通过注册表为其提供支持。

As discussed earlier, it's a stand-in for the implementation-dependent construction of a subject and principals backed by a registry for our testing purposes.

youdao

在第27行，使用主题名称构造消息以待发布。

In line 27 you construct the message to be published using the topic name.

youdao

您可以让构造汇总表和列出链接主题这样的事情自动完成。

You can automate things like building summary tables and listing linked topics.

youdao