Wordpress, non-standard use of <-- more --> tag

On any WordPress site, we use the <-- more --> tag , it is designed to hide part of the post, or in another way it can be called "Abstract to the post". Deepening our knowledge of the WordPress engine.

Few people know that there are interesting additional features when working with this tag.

For example, to replace the link text "Read more" with any other:

For a good example, see the abstract of this article.