出处:按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第62页(229字)
年轻力壮的时候不奋发图强,到了老年,悲伤也没有用了,例老师一再告诫学生们要发愤读书,免得少壮不努力,老大徒伤悲。
The teacher reminds his students time and again to work hard while young,other wise it could be too late when they are old