来自《耶鲁大学开放课程：金融市场 第1集 第1集》

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  An option is a contract that says
  期权就是指你可以
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  you can buy so many shares of a company.
  在公司里购买多少股份的一份合同
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  The options have been traded for several decades,
  期权最初从芝加哥期权交易所进行交易
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  starting with the Chicago Board Options Exchange.
  到现在已经交易了几十年
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  But now there are many options exchanges.
  现在有许多期权交易所了
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  We have prices of options that change minute by minute.
  期权价格瞬息万变
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  Now what do these changes and these prices mean?
  现在 这些变化和价格意味着什么呢
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  The options are a very useful technology
  期权是管理风险的
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  for managing risks and
  一个非常有用的技术
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  I think that we'll see a rapid--Over the next few decades,
  我认为在往后的几十年
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  we'll see rapid expansion in the scope of
  交易市场上
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  options contracts traded on the exchanges.
  我们将会看到期权合同的迅速发展