"伦理修养运动" can be translated into English as "the movement for ethical cultivation" or "the campaign for ethical self-improvement".
"Ethical cultivation" emphasizes the process of nurturing and developing one's ethical values and behaviors.
"Ethical self-improvement" highlights the personal effort and initiative to enhance one's ethical standards.
Both translations capture the essence of the original Chinese phrase, which refers to a movement or campaign aimed at improving individuals' ethical qualities and moral standards.