2, don't wait, white young head, empty and sad. From Yue Fei's "Man Jiang Hong"
3, Sanchunhua is good, you must learn early. Flowers bloom and fall, and life grows old. "precious time" from anonymity
4, black hair does not know how to study hard early, Bai Shoufang regrets studying late. From Yan Zhenqing's Persuasion.
5, young people are eager to learn, and an inch of time is not light. I didn't feel the dream of spring grass in the pond, and it was autumn before walking on the steps. -from Zhu's "Accidental Success"