来自《耶鲁大学开放课程：金融市场 第23集 第23集》

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  let's say a share of stock--at a specified price and specified date.
  某种资产 比如一手股票
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  There are two kinds; there's a put and a call.
  期权分为看跌和看涨两种
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  A put option is the right to sell.
  看跌期权赋予其所有者卖出资产的权利
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  It's typically a hundred shares, so we'll say a hundred shares
  通常每份期权对应一手股票
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  of a company; let's say it's Google.
  比如说一手股谷歌的股票
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  The option would have--if it was a put option and there was a price,
  对于一份看跌期权来说
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  then you would have the right up--let me see, there's the exercise price,
  合约中会规定一个协议价格
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  also known as the strike, and there's the exercise date.
  或者叫执行价格 以及一个行权日
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  I should also emphasize that there are two kinds of options.
  我还要强调期权有两种不同类型
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  There are American, so called, and European, so called.
  分别叫做美式期权和欧式期权
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  It has nothing to with whether they are in America or Europe
  它们的名称与其交易地点无关
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  because in Europe they trade both American options and European options
  因为欧洲期权市场上即有美式也有欧式期权