我去抓finance yahoo的圖來看.嚇人難怪稱的上史上最大跌幅而且一天就能達成http://finance.yahoo.com/echarts?s=^DJI#chart2:symbol=^dji;range=5y;indicator=volume;charttype=line;crosshair=on;ohlcvalues=0;logscale=on;source=undefined