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。
【正确答案】：修改:股票价格自泡沫经济瓦解之后便跌至历史最低点。
原文: Stock prices have dropped to an all time low since the colla
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