来自《耶鲁大学开放课程：基础物理 第7集 第7集》

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  because they're not even of the right sign.
  因为它们甚至在符号上都不统一
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  You don't even have to think more than that.
  你们都不用多花心思想
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  They cannot be right as they are. Yes?
  它们怎么都是不对 请讲
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  No, h is the number of meters above the ground.
  不行 h 是物体距离地面的高度
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  You put the number in.
  是要代入具体数值的
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  Look, most of your escape routes don't work
  大多数人的思路都没法解决问题
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  because you're trying to
  因为你一直在尝试
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  get a positive number to equal a negative number.
  让负值和正值相等
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  Yes?
  请讲
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  Thank you.
  谢谢你
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  I didn't know I was going home for lunch,
  我差点以为不能回家吃午饭了
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  because I was not going to proceed
  因为我打算在听到正确答案之前