美股自1950年以来，历史数据显示，当标准500指数跌破200天均线时，4月份是该指数表现最强劲的月份之一，平均涨幅超过2%。
Historical data on U.S. stocks since 1950 shows that when the Standard 500 Index falls below its 200-day average, April is one of the strongest performing months for the index, with an average gain of more than 2 percent.
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