Daily Chinese Idiom Guessing Game
To set an example by one's own actions; to practice what you preach.
则准则，榜样。以自己的行动做出榜样。
巴金《家》二十五这其间不顾一切阻碍以身作则做一个开路先锋的便是许倩如。”
A good teacher leads by example, always arriving on time and prepared.