In the US, for example, the Standard and Poor’s 500 index in July recorded six days of declines and only three days of increases amounting to more than 1%. In June, the index dropped more than 1% on four days, and gained more than 1% on two days.
比如说，美国7月份的标准普尔指数涨跌幅超过1%的天数中，下跌的有6天，而上涨的只有3天。而6月份，下跌超过1%的为4天，上涨超过1%的为2天。再往前，2007年2月27日暴跌了3.5%，却没有像样的反弹。