删除文章和注册用户的固定模块属于日常工作。
Articles for Deletion and permanent blocks of registered users are standard jobs.
从以前的文章中知道，导出允许服务调用到模块，导入允许模块调用其他服务。
Recall from the previous articles that an export allows service calls into a module and an import allows a module to call other services.
我建议在阅读本节之前，阅读我关于用Persistent模块保存数据的文章。
I suggest reading my article on saving data with the Persistent modules before you tackle this section.
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