"Take the case as a mirror, and the alarm will ring" means: take the case or incident as a warning, always remind yourself not to repeat the same mistakes and show vigilance. This is a common sentence in warning education, which is used to remind people to learn from other people's mistakes in order to avoid making the same mistakes themselves.

This sentence emphasizes the importance of warning education, reminding people to always be vigilant, keep learning and making progress, and avoid making mistakes. In life and work, we are faced with all kinds of challenges and problems, and sometimes we make mistakes, but by learning from the experience of others, we can better cope with these challenges and problems.

Therefore, "Take the case as a mirror, the alarm bell will ring" is a very meaningful warning slogan, reminding us to always be vigilant, keep learning and keep improving, so as to avoid making mistakes and move towards a better future.