来自《耶鲁大学开放课程：有关食物的心理学、生物学和政治学 第1集 第1集》

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  is let's say you have a child
  假如你有个小孩
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  who lives in this sort of circular area here,
  居住在我画圈的这块区域
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  who lives here and his friends with a child who lives here.
  他住在这儿 而他的朋友们住在这儿
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  Then that's not a very long distance,
  他们离得不远
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  probably easily walkable in a few minutes;
  可能走几分钟就到了
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  but that child can't be walking through everybody's yard.
  但是你的孩子却不能直接走到他的朋友家
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  How do you get there? You go to go here,
  那要怎么才能去呢 你得绕道这里
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  here and these could be busy roads,
  还有那里的繁忙路段
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  and so parents don't want to do it because of safety reasons,
  出于安全原因家长们不允许孩子们这么做
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  so you see how--when the country used to be laid out in a grid,
  可以看到 规划为网格状道路的地区
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  like say New York City still is today,
  比如依旧保留了传统规划的纽约
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  then people walk to get to places.
  人们出行是靠步行