If you keep shorting in a shorting trend, you will inevitably switch your mindset from shorting to long in the final shorting stage. Therefore, you must set a quantifiable standard for this switch, such as turning around when a certain signal appears. This is like driving a car. You keep driving forward, and when a certain signal appears, you will turn around without hesitation. You must determine this signal in advance. This is the scientific nature of Mingge's trading system.