来自《耶鲁大学开放课程：博弈论 第14集 第14集》

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  So for those of you in Econ 150,
  对于学过经济学150课程的同学
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  this should be a very familiar kind of thing.
  这里的解法就比较容易理解
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  This is a constrained optimization problem
  这是个约束优化的问题
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  and you've been having constrained optimization problems
  你们上个月已经学过约束优化问题
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  rammed into you for the last month or so,
  郁闷过一次了不是吗
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  so this is an example of a constrained optimization problem.
  这个就是有约束优化问题的一个例子
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  You have to choose a point
  你得选择一个点
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  but you can't choose a point freely:
  但你不能无所顾忌地选择
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  you have to choose a point on the line.
  这个点必须是这条线上的
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  Okay, so let's talk about it a bit more before we do the math.
  好 在数学解答之前再说点其他的
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  Let's actually redraw it again
  我还是重画一下吧
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  since I made a mess of this picture.
  这幅图已经一团糟了