The longer the line, the more chips there are in this cost area, which is the cost area for most people. If the stock price is above this area, most people will make a profit, and the stock price will fall at any time because of profit selling. If the stock price is below this area, this area will become a pressure area, and there will be a lot of resistance when the stock price reaches this position; The short nature is the cost area of a few people.