軌道的外延平行線

股價不管突破哪一條價格邊線或以何種方式突破，沿突破方向所做的與原通道等寬的外延平行線即為股價的運動幅度.

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.