Thank you very much for telling me a very fantastic editor.
I visited the site you mentioned, downloaded the program, and tried it for hours. And, unfortunately, I have identified a few trivial but important facts that the program does not fully support LaTex.
In particular, there was something I wasn't happy with about inline LaTex. It is more of a problem with my LaTex code itself than a problem with the program.
Anyway, I came back to Pages. It was a short but intense tour.
Thank you.