随着对冲基金和其它资金雄厚的市场人士抛出股票，满足经纪商的追加保证金要求，市场进一步下跌，迫使其他人抛售。
As hedge funds and other deep-pocket players unload stock to cover margin calls from their brokers, the market falls further, forcing others to sell.
如果股市下跌，而你拥有通过保证金购买的股票，你就会收到经纪商追加保证金的要求，让你向帐户中追加资金或是股票。
If the stock market plunges and you own shares on margin, you could receive a margin call from your broker, asking that you add more cash or securities to your account.
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