There is no very accurate way to determine this. Generally, a profit of 20%-30% at the bottom can be regarded as the main chip; There are also chip-intensive peaks that are long-term sideways or may be the main chips; There is also a time-sharing chart in which there is no special news one day and the trading volume has increased, and the chips are at the bottom of the sucking stage. It is also possible that the chips will move up quickly. . . There are many methods, mainly from the analysis of subject behavior. No one can be sure, not even the stock god. We can only make a general analysis based on past experience.