是否有办法确保某些主题肯定包含在摘要邮件中?

You can set the category in a way that only admins can create topics inside that category and no one else and the other users can only read them.

However if you want to send only the summary emails this setting is not for you, it does not affect the summary emails because in any case links of topics that are “New for you” are still sent, see

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