In fact, evacuation and concentration may not take too long, because it doesn't take too long to evacuate. I sometimes wonder, if I don't warn you of the risks, can you evacuate on your own? evacuation requires perceiving the risks of the market and restraining one's greed; Where is the difficulty of concentration? It is to judge how long the market is likely to retrace, because the first step of withdrawal is the coin ➤ U, and the second step is to focus on the U ➤ coin. The span of the first to second steps is the most difficult to judge.