To be mentally alert and sharp in your old age, you must remain mentally active throughout your life.要想在年老时仍然思维敏捷，你必须在一生中都保持思想活跃。The student going to art or drama school will be very enthusiastic about further education. His is not a narrow mind, but one eager to grasp every facet of anything he studies.上艺术或戏剧学校的学生会渴望继续深造。他们思想活跃，迫切地想要掌握自己所学知识的每一个方面。