当价格击穿最近20天低点，就会触发我们的卖出止损指令，退出交易。
When prices fall back through the lowest low price of the last twenty days, the trade is exited using a sell stop order.
“如果没有止损指令，你无法在CapitalSpreads建立头寸，”德纳姆解释道。
"You cannot have a position with Capital Spreads without having a stop - loss," explains Denham.
因此，在8月17日，空头投资者本可以设置止损指令，在富时100指数或道琼斯指数仅上涨几个百分点时就清空空头头寸。
So short sellers on August 17 could have placed stops to get them out of their downside bets as soon as the FTSE 100 or Dow rose by just a few per cent.
因此，在8月17日，空头投资者本可以设置止损指令，在富时100指数或道琼斯指数仅上涨几个百分点时就清空空头头寸。
So short sellers on August 17 could have placed stops to get them out of their downside bets as soon as the FTSE 100 or Dow rose by just a few per cent.
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