轨道的外延平行线

股价不管突破哪一条价格边线或以何种方式突破，沿突破方向所做的与原通道等宽的外延平行线即为股价的运动幅度.

If DIA breaks the $82(neck line) , it would stop at around $76.

So, $82 is very very 重要的 life line to the stock market at present.