The works written by calligraphers, no matter a dozen words or dozens of words, are all waiting for the horse, in one go, between the lines.

"Waiting by the horse" means "drafting documents by the horse that is about to go out, and you can wait for the final draft. Describe quick thinking and quick writing. Thin: thin. " This word can be used as predicate and attribute; It refers to people's quick thinking, which can't be used to describe doing things faster and can't be equated with "just around the corner".