来自《耶鲁大学开放课程：金融市场 第21集 第21集》

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  If I hold on--if I rolled into July futures and hold on,
  如果我继续将期货合约滚动到7月
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  I'm going to lose really big time,
  我会遭受很大损失
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  so I'm out--I'm out of the business.
  于是我退出
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  We sell off everything in the warehouse and we're done.
  我们将库存全部出售 然后结束
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  This is the process by which warehousing is optimized
  这是仓储的最优过程
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  and we get grain smoothly through the year,
  我们全年都能平稳地得到谷物供应
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  but it's the basic principle that we'll see in the next lecture--
  这是我们下一讲的基本原则
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  extends as well to other kinds of financial futures
  适用于其他种类的金融期货
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  Next period, we're going to talk about other kinds of futures,
  下节课 我们会讨论其他种类的期货
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  including financial futures.
  包括金融期货