Another situation is that during the process of rising or falling at a high or low level, there is a sudden drop or rise, a rapid or rapid drop or rise, and there is usually a large rebound or rebound trend, even a large one, and the cycle may not be short, that is, a long cycle of wide oscillation or process, which usually indicates that the previous continuous rise or fall trend has ended and is about to reverse. If two oscillations are repeated and the amplitude of the latter one is greater, exceeding the lowest or highest point of the previous one, then the reversal can be confirmed with certainty.