Wang Yuan was unconscious and wasting time in his studies. He should be persuaded by saying that he was too late to study hard and was too late to study hard. According to relevant public information, black-haired people don't know how to study hard early, and white-haired people regret studying late. From "Encouraging Learning" by Yan Zhenqing of the Tang Dynasty, it explains: A young man does not know how to get up early and study diligently. When he is old, it will be too late to regret that he has not studied enough. In line with the meaning of the question, the language of this sentence is concise and concise. It encourages young people to cherish their youth, study diligently and make a difference.