"Cultivate one's demeanor" is a common phrase used in Engpsh to describe the process of improving and refining one's personal quapties and behavior.

This phrase originates from the idea of nurturing and developing a positive and desirable personapty trait, such as confidence, poise, grace, or elegance, through intentional effort and practice.

Here are some examples of the phrase in context:

"By reading books, learning new skills, and surrounding himself with positive people, he was able to cultivate his demeanor and become a more confident and successful individual."
"She took dance lessons to help cultivate her grace and poise, and now she exudes elegance and charm in all that she does."
"Through mindfulness and meditation, he was able to cultivate a calm and peaceful demeanor, which allowed him to handle stressful situations with ease."

Translation:

"他通过读书，学习新技能，与积极的人群交往，从而培养了自己的气质，成为了一个更自信、更成功的人。"
"她学习舞蹈来帮助培养她的优雅和信心，现在她在她所做的一切中散发出优雅和魅力。"
"通过正念和冥想，他能够培养出一种平静和平和的气质，从而轻松应对压力的情况。"