Life requires precipitation, tranquility is the key to success; Life requires reflection, often looking back, in order to sublimate in savoring gains and losses and joys and sorrows. Looking forward is a dream and goal; Looking back is for verification and correction. How many things would have been better done if we had looked back at them in the past; How many choices, if we can look back, can we avoid many mistakes and regrets. Looking back, in fact, the road ahead is also written behind me.