Retreat refers to the extent to which the fund's net value falls from the highest point in history to the current point, while fund withdrawal repair refers to the height to which the net value rebounds from the lowest point to the starting point of withdrawal. In the process of retracement and repair, the net value of the fund is expected to generate income. It is because when the fund withdrew from the repair, the market sentiment improved, investors' confidence increased, and funds began to flow into the market, pushing up the net value of the fund. Some investment strategies will use the opportunity of retracement and repair to buy and gain income.