One solution often suggested to 减少垃圾评论 is to disable comments on older posts. There is an option on the Discussion settings page where you can turn off comments on posts older than a certain number of days. The problem with this solution is that it blocks comments on posts where you would really like your users to continue discussion. In this article, we will show you how to override comment deadline in WordPress and keep comments open on certain posts.
如何在WordPress中禁用对旧帖子的评论 （How to Disable Comments on Older Posts in WordPress）
If you are getting a lot of spam on older posts on your WordPress blog, then WordPress offers a simple solution to turn off comments on older articles. All you need to do is go to 设置 » 讨论, and check the box next to option “自动关闭对超过几天的文章的评论”. You can enter the number of days here and then save changes.