Supplement: In the long-term sideways, there was a sudden decline in trading volume for a period of time. In general, the external disk is larger than the internal disk, that is, the active purchase is larger than the external disk; And the stock price can be supported by the long-term trend line, generally supported by the 56-day and 90-day moving averages, and the extreme market can be seen by the 120 and 250-day moving averages. There may also be mistakes in operation, so the opening of positions should be gradual. Once the trend is clear, Man Cang will enter.