原文: Stock prices have dropped to an all time low since the collapse of the bubble economy.
译文:自泡沫经济崩溃以来，股票价格已跌至历史最低。

原文: Stock prices have dropped to an all time low since the collapse of the bubble economy.
译文:自泡沫经济崩溃以来，股票价格已跌至历史最低。

修改:股票价格自泡沫经济瓦解之后便跌至历史最低点。