#美股熔断# 今天美股惨烈，标普500指数早盘跌超7%触发第一层熔断机制。（简单讲熔断机制：可以理解为保险丝，当股市跌到一定幅度之后，市场自动停止交易一段时间。美股的熔断机制有三个级别。前两个级别股市会暂停交易15分钟，即标普500单日跌7 …
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