Burr: name of stitch. One of the nine thorns. "Lingshu Guan Zhen": "Those who have burrs will stab the skin." That is to say, shallow skin acupuncture is a method to treat floating arthralgia, and the commonly used skin acupuncture is developed from this.

When some points in the exchange rate break through the trend line and other high points are on the trend line, we call this breakthrough "burr" phenomenon.

When the exchange rate meets the resistance level of the first trend line, it can partially close the position. After rising above the resistance level of the first trend line, it will move to the second trend line and completely close the position before the second trend line.

When the exchange rate falls back, it attracts positions above the first trend line, and then sells high and attracts low between the first and second trend lines.